Morden
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Morden clear sky chart from 2005-11-05 to 2017-09-23.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
36%
16287
13%
46858
7%
16244
41%
16244
21%
33075

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 15thNight
26%
899
10%
2685
6%
895
31%
895
13%
2065
January16th to endNight
23%
960
11%
2697
4%
960
30%
960
13%
2112
February1st to 15thNight
33%
876
11%
2354
4%
875
38%
875
17%
1758
February16th to endNight
32%
717
13%
1979
5%
717
38%
717
18%
1497
March1st to 15thNight
32%
651
12%
2091
7%
651
38%
651
17%
1503
March16th to endNight
35%
576
13%
2112
9%
576
41%
576
14%
1518
April1st to 15thNight
37%
539
17%
1714
11%
539
47%
539
24%
1102
April16th to endNight
40%
540
14%
1620
11%
540
45%
540
20%
1141
May1st to 15thNight
37%
540
12%
1519
5%
540
40%
540
24%
1033
May16th to endNight
41%
563
11%
1311
5%
561
44%
561
31%
908
June1st to 15thNight
46%
540
5%
1260
3%
540
48%
540
32%
867
June16th to endNight
51%
540
6%
1260
3%
540
54%
540
34%
844
July1st to 15thNight
58%
510
10%
1190
6%
510
61%
510
45%
735
July16th to endNight
62%
564
16%
1307
8%
531
64%
531
47%
752
August1st to 15thNight
58%
539
17%
1534
9%
536
61%
536
37%
907
August16th to endNight
56%
573
22%
1719
18%
573
62%
573
39%
951
September1st to 15thNight
52%
540
18%
1829
16%
540
60%
540
34%
994
September16th to endNight
43%
516
21%
1903
17%
516
53%
516
26%
1119
October1st to 15thNight
31%
606
17%
1926
10%
606
37%
606
19%
1320
October16th to endNight
32%
863
12%
2271
5%
863
36%
863
20%
1650
November1st to 15thNight
29%
875
14%
2396
5%
875
36%
875
20%
1726
November16th to endNight
25%
900
13%
2601
6%
900
30%
900
16%
1974
December1st to 15thNight
27%
900
6%
2700
3%
900
31%
900
11%
2156
December16th to endNight
19%
960
7%
2880
3%
960
24%
960
8%
2443

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
12%8%36%6%35%5%5%7%34%
48068
Night
10%9%47%6%35%5%5%7%35%
47010
Cloud CoverDay
12%8%36%6%35%5%5%7%34%
48078
Night
10%9%47%6%35%45%6%36%
47013
Cloud CoverDay
12%8%36%6%35%5%5%7%34%
48079
Night
10%9%47%6%35%45%6%36%
47014
Cloud CoverDay
12%8%36%6%35%5%5%7%34%
48077
Night
10%9%47%6%35%45%7%35%
47014
TransparencyDay
47%7%14%21%7%
47737
Night
47%7%13%21%8%
46858
SeeingDay
15%7%29%28%15%3
6272
Night
15%7%31%31%12%1
16292

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
8%11%5%9%7%45%7%7%6%25%
1253
16th to endDay
8%13%7%8%7%5%9%6%6%6%18%
1524
February1st to 15thDay
8%11%47%10%47%6%5%6%28%
1509
16th to endDay
9%9%5%11%9%5%7%7%7%7%18%
1503
March1st to 15thDay
10%12%411%9%46%5%5%6%22%
1858
16th to endDay
13%12%38%8%5%6%5%5%7%23%
2112
April1st to 15thDay
11%9%5%6%5%235%6%7%36%
2231
16th to endDay
16%9%36%5%2445%7%32%
2340
May1st to 15thDay
18%9%35%5%34445%33%
2430
16th to endDay
18%7%25%424446%35%
2803
June1st to 15thDay
16%7%36%6%35%5%6%8%32%
2700
16th to endDay
12%5%35%6%35%6%6%8%36%
2700
July1st to 15thDay
8%5%15%5%35%5%6%8%43%
2700
16th to endDay
6%314435%5%6%9%49%
2770
August1st to 15thDay
8%425%5%45%5%6%8%42%
2417
16th to endDay
9%42343345%7%51%
2483
September1st to 15thDay
11%5%245%2435%7%47%
2130
16th to endDay
15%5%25%433348%44%
1893
October1st to 15thDay
15%9%25%5%24447%37%
1692
16th to endDay
15%11%36%5%345%5%7%30%
1599
November1st to 15thDay
12%11%5%7%6%345%46%32%
1461
16th to endDay
11%15%6%10%8%45%336%25%
1356
December1st to 15thDay
10%13%6%12%8%26%6%5%6%20%
1260
16th to endDay
13%13%6%11%9%5%6%6%4320%
1344
January1st to 15thNight
7%13%49%9%36%6%6%5%25%
2685
16th to endNight
9%12%6%10%7%36%46%6%24%
2697
February1st to 15thNight
7%12%47%7%46%6%6%6%30%
2351
16th to endNight
8%10%49%7%6%6%5%5%6%28%
1979
March1st to 15thNight
9%11%48%6%36%45%6%31%
2079
16th to endNight
12%9%5%9%6%3445%7%31%
2112
April1st to 15thNight
8%7%36%5%35%6%5%7%40%
1714
16th to endNight
15%9%36%5%35%446%35%
1620
May1st to 15thNight
17%7%34434347%38%
1519
16th to endNight
15%6%1342446%7%42%
1310
June1st to 15thNight
13%5%1443445%9%43%
1260
16th to endNight
10%3144335%7%10%44%
1260
July1st to 15thNight
6%31332345%8%56%
1260
16th to endNight
321332445%9%58%
1397
August1st to 15thNight
7%4145%2435%7%52%
1542
16th to endNight
7%213323448%57%
1719
September1st to 15thNight
10%314312447%55%
1829
16th to endNight
13%5%25%42335%6%47%
1903
October1st to 15thNight
13%7%35%6%45%5%47%37%
1926
16th to endNight
13%10%35%6%25%46%7%34%
2271
November1st to 15thNight
12%11%46%6%245%5%8%33%
2396
16th to endNight
11%13%5%8%7%34446%30%
2601
December1st to 15thNight
8%13%8%11%8%46%6%46%22%
2700
16th to endNight
14%14%7%12%10%45%44416%
2880

Percentage Cloud Cover NW (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
8%11%5%9%7%5%5%6%7%6%26%
1254
16th to endDay
8%14%6%9%7%5%9%5%6%7%18%
1524
February1st to 15thDay
9%10%48%9%47%6%6%6%27%
1509
16th to endDay
9%9%5%11%9%6%6%7%7%8%18%
1503
March1st to 15thDay
10%12%5%10%10%45%447%23%
1869
16th to endDay
14%11%48%7%46%45%7%24%
2110
April1st to 15thDay
11%10%5%5%5%3345%7%36%
2231
16th to endDay
16%9%37%5%2445%6%33%
2340
May1st to 15thDay
18%10%35%5%3445%5%33%
2430
16th to endDay
19%8%2432445%7%35%
2803
June1st to 15thDay
16%6%36%6%25%5%6%7%31%
2700
16th to endDay
13%5%26%5%35%6%6%9%36%
2700
July1st to 15thDay
8%425%5%35%5%6%8%43%
2700
16th to endDay
6%314425%5%6%9%49%
2770
August1st to 15thDay
9%425%5%346%6%8%42%
2417
16th to endDay
9%42442445%6%52%
2483
September1st to 15thDay
11%5%15%5%24447%47%
2130
16th to endDay
15%6%24423347%45%
1893
October1st to 15thDay
16%9%25%5%2436%6%37%
1692
16th to endDay
16%10%36%5%35%5%5%8%29%
1599
November1st to 15thDay
12%11%5%7%6%345%5%6%32%
1461
16th to endDay
11%14%6%10%8%44436%25%
1356
December1st to 15thDay
10%12%8%12%7%346%5%6%20%
1260
16th to endDay
13%12%5%11%9%46%6%5%419%
1344
January1st to 15thNight
7%13%5%8%9%35%6%6%6%25%
2685
16th to endNight
9%12%6%10%7%36%5%6%6%24%
2697
February1st to 15thNight
7%11%47%7%37%7%6%7%30%
2344
16th to endNight
8%9%5%8%6%5%7%5%6%6%28%
1979
March1st to 15thNight
10%11%5%8%6%36%45%7%30%
2091
16th to endNight
13%9%5%8%5%3445%7%31%
2110
April1st to 15thNight
8%6%46%5%26%5%5%7%40%
1714
16th to endNight
16%8%36%5%36%445%36%
1620
May1st to 15thNight
17%7%25%5%3435%5%38%
1518
16th to endNight
15%6%2332446%7%42%
1311
June1st to 15thNight
13%4235%3345%8%44%
1260
16th to endNight
10%3235%3447%9%45%
1260
July1st to 15thNight
6%31332345%8%56%
1260
16th to endNight
322242436%8%59%
1397
August1st to 15thNight
7%4245%2435%7%52%
1542
16th to endNight
7%2134235%47%57%
1719
September1st to 15thNight
10%323312447%55%
1829
16th to endNight
14%425%41335%6%47%
1903
October1st to 15thNight
12%8%35%6%345%47%37%
1926
16th to endNight
13%10%26%6%25%46%7%34%
2271
November1st to 15thNight
11%11%46%5%245%5%7%33%
2396
16th to endNight
11%12%5%9%7%2445%6%29%
2601
December1st to 15thNight
8%13%8%11%8%46%5%46%23%
2700
16th to endNight
14%14%7%12%9%5%5%44416%
2880

Percentage Cloud Cover SW (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
7%12%5%9%7%45%7%7%6%25%
1253
16th to endDay
8%14%6%9%7%6%8%6%6%6%18%
1524
February1st to 15thDay
9%10%47%10%46%6%5%5%27%
1509
16th to endDay
9%9%6%9%9%5%8%7%6%7%19%
1503
March1st to 15thDay
11%11%5%10%9%45%5%5%7%22%
1869
16th to endDay
13%12%48%8%5%6%5%6%7%24%
2112
April1st to 15thDay
11%10%46%5%2445%7%36%
2231
16th to endDay
17%8%36%5%2445%7%33%
2340
May1st to 15thDay
18%9%35%5%34445%34%
2430
16th to endDay
18%7%34425%447%36%
2803
June1st to 15thDay
16%7%36%6%35%46%7%32%
2700
16th to endDay
12%5%35%6%25%6%6%8%37%
2700
July1st to 15thDay
8%5%246%35%5%6%8%43%
2700
16th to endDay
6%314425%5%6%9%50%
2770
August1st to 15thDay
9%4246%35%5%6%8%42%
2417
16th to endDay
9%42343435%7%51%
2483
September1st to 15thDay
11%5%235%2435%7%47%
2130
16th to endDay
15%5%24424347%45%
1893
October1st to 15thDay
16%9%25%434347%37%
1692
16th to endDay
15%11%35%5%345%5%8%29%
1599
November1st to 15thDay
12%11%5%7%5%35%45%5%32%
1461
16th to endDay
11%14%6%10%8%35%345%25%
1356
December1st to 15thDay
10%13%6%12%8%26%6%46%20%
1260
16th to endDay
13%13%6%11%9%5%6%5%4419%
1344
January1st to 15thNight
7%13%5%9%9%36%6%5%6%25%
2685
16th to endNight
10%12%6%10%7%46%46%6%24%
2697
February1st to 15thNight
7%12%47%7%36%6%6%6%30%
2344
16th to endNight
8%10%49%6%6%7%5%6%5%29%
1979
March1st to 15thNight
10%11%48%6%36%45%6%31%
2091
16th to endNight
13%9%5%9%6%35%45%7%31%
2112
April1st to 15thNight
8%7%25%6%35%6%6%7%40%
1714
16th to endNight
16%8%35%6%35%446%36%
1620
May1st to 15thNight
17%7%345%24446%39%
1518
16th to endNight
15%6%2341446%6%42%
1310
June1st to 15thNight
13%41443446%8%44%
1260
16th to endNight
9%314425%5%7%9%45%
1260
July1st to 15thNight
6%3133235%5%8%56%
1260
16th to endNight
3212425%46%9%57%
1397
August1st to 15thNight
7%3145%3445%7%52%
1542
16th to endNight
7%313323448%57%
1719
September1st to 15thNight
9%414312347%55%
1829
16th to endNight
14%5%25%423445%48%
1903
October1st to 15thNight
13%7%35%6%445%47%38%
1926
16th to endNight
14%10%25%6%2446%7%34%
2271
November1st to 15thNight
12%11%46%5%2445%8%33%
2396
16th to endNight
11%13%5%8%7%34346%30%
2601
December1st to 15thNight
9%13%7%11%9%45%5%36%22%
2700
16th to endNight
14%14%7%13%9%45%5%3416%
2880

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
7%13%5%9%6%46%6%8%5%25%
1253
16th to endDay
9%13%7%9%7%5%8%6%6%6%17%
1524
February1st to 15thDay
9%9%5%7%10%47%5%6%6%26%
1509
16th to endDay
9%9%6%10%9%6%7%7%6%7%18%
1503
March1st to 15thDay
11%11%5%10%9%46%45%7%22%
1869
16th to endDay
13%11%49%8%46%5%5%8%23%
2110
April1st to 15thDay
11%10%46%5%3445%7%36%
2231
16th to endDay
17%8%36%6%2345%7%33%
2340
May1st to 15thDay
18%10%35%5%34346%33%
2430
16th to endDay
19%7%34425%447%36%
2803
June1st to 15thDay
15%7%35%5%35%5%5%8%32%
2700
16th to endDay
12%5%245%35%6%6%8%37%
2700
July1st to 15thDay
8%4245%35%5%7%9%42%
2700
16th to endDay
6%313435%5%6%9%50%
2770
August1st to 15thDay
8%5%25%5%35%5%6%8%43%
2417
16th to endDay
9%424424448%51%
2483
September1st to 15thDay
11%5%25%5%24447%46%
2130
16th to endDay
14%5%25%323348%44%
1893
October1st to 15thDay
16%9%35%5%2435%7%37%
1692
16th to endDay
15%11%35%5%35%5%5%8%30%
1599
November1st to 15thDay
12%11%48%5%345%46%32%
1461
16th to endDay
11%14%7%9%8%34345%25%
1356
December1st to 15thDay
10%14%7%11%7%36%6%6%6%19%
1260
16th to endDay
13%13%6%11%9%5%6%44419%
1344
January1st to 15thNight
7%14%5%9%9%46%5%6%5%24%
2685
16th to endNight
10%12%6%10%8%36%46%7%23%
2697
February1st to 15thNight
7%11%48%6%36%7%6%7%29%
2344
16th to endNight
8%9%5%8%6%5%8%5%5%6%29%
1979
March1st to 15thNight
10%10%5%8%6%35%45%6%31%
2091
16th to endNight
13%9%5%8%6%25%5%5%7%30%
2112
April1st to 15thNight
8%7%35%5%35%6%6%7%40%
1714
16th to endNight
15%8%36%436%446%36%
1620
May1st to 15thNight
17%8%25%5%24346%38%
1518
16th to endNight
14%6%2341446%8%41%
1310
June1st to 15thNight
13%423425%45%9%43%
1260
16th to endNight
9%3244246%7%9%44%
1260
July1st to 15thNight
5%31431446%8%56%
1260
16th to endNight
331332446%9%57%
1397
August1st to 15thNight
6%3245%2435%7%52%
1542
16th to endNight
6%21432335%8%56%
1719
September1st to 15thNight
9%423313347%55%
1829
16th to endNight
13%6%2442335%6%47%
1903
October1st to 15thNight
13%8%25%6%45%437%37%
1926
16th to endNight
14%9%36%5%2446%7%34%
2271
November1st to 15thNight
12%11%46%43445%7%33%
2396
16th to endNight
11%13%5%8%7%34347%29%
2601
December1st to 15thNight
9%13%7%11%8%45%5%46%22%
2700
16th to endNight
14%14%7%12%8%46%5%45%15%
2880

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
55%7%12%19%4
1254
16th to endDay
63%8%8%14%4
1524
February1st to 15thDay
54%7%14%17%6%
1510
16th to endDay
61%6%11%15%4
1503
March1st to 15thDay
60%7%14%13%4
1869
16th to endDay
58%9%11%15%4
2112
April1st to 15thDay
46%7%14%23%7%1
2231
16th to endDay
49%7%14%16%10%1
2340
May1st to 15thDay
52%5%9%24%7%
2430
16th to endDay
48%6%12%20%10%1
2807
June1st to 15thDay
48%8%16%19%6%
2700
16th to endDay
42%10%16%24%5%
2700
July1st to 15thDay
35%8%18%29%8%
2541
16th to endDay
30%9%20%29%10%
2597
August1st to 15thDay
36%10%17%26%7%1
2401
16th to endDay
31%7%15%32%13%
2483
September1st to 15thDay
36%7%19%25%10%
2130
16th to endDay
39%7%15%29%8%
1893
October1st to 15thDay
47%6%13%24%7%
1692
16th to endDay
51%9%17%16%5%
1599
November1st to 15thDay
52%7%12%17%8%1
1461
16th to endDay
59%8%10%15%4
1356
December1st to 15thDay
62%8%11%14%2
1260
16th to endDay
66%7%7%12%4
1344
January1st to 15thNight
57%7%9%17%7%
2685
16th to endNight
58%7%12%14%7%
2697
February1st to 15thNight
49%9%12%18%9%
2354
16th to endNight
54%6%12%19%6%
1979
March1st to 15thNight
51%7%14%18%7%
2091
16th to endNight
52%7%12%20%5%
2112
April1st to 15thNight
40%7%13%23%13%2
1714
16th to endNight
49%5%11%18%12%1
1620
May1st to 15thNight
45%5%12%25%10%
1519
16th to endNight
41%6%13%22%16%
1311
June1st to 15thNight
37%8%18%25%8%1
1260
16th to endNight
32%10%19%28%8%
1260
July1st to 15thNight
24%8%14%37%13%1
1190
16th to endNight
21%7%16%37%15%
1307
August1st to 15thNight
29%7%17%32%10%2
1534
16th to endNight
25%7%15%33%17%1
1719
September1st to 15thNight
28%6%16%30%15%1
1829
16th to endNight
37%5%15%29%11%
1903
October1st to 15thNight
45%8%14%23%7%
1926
16th to endNight
47%8%14%24%4
2271
November1st to 15thNight
48%7%15%18%7%2
2396
16th to endNight
54%8%13%18%5%
2601
December1st to 15thNight
62%7%13%13%3
2700
16th to endNight
70%6%8%11%3
2880

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
12%5%28%38%12%2
90
16th to endDay
18%329%36%10%2
96
February1st to 15thDay
18%14%40%24%2
90
16th to endDay
19%138%35%4
81
March1st to 15thDay
12%7%36%36%6%
90
16th to endDay
21%7%30%25%12%3
96
April1st to 15thDay
13%16%31%27%10%
350
16th to endDay
21%9%28%25%12%2
450
May1st to 15thDay
21%9%31%23%11%2
468
16th to endDay
22%8%27%24%15%2
517
June1st to 15thDay
18%8%32%21%13%5%
495
16th to endDay
14%7%27%32%15%3
495
July1st to 15thDay
11%426%29%21%7%
475
16th to endDay
6%5%27%35%19%5%
515
August1st to 15thDay
10%327%29%20%8%
493
16th to endDay
7%5%28%30%21%5%
523
September1st to 15thDay
15%6%28%31%16%2
285
16th to endDay
20%12%31%20%11%2
111
October1st to 15thDay
21%7%32%30%7%1
90
16th to endDay
26%9%22%27%12%2
96
November1st to 15thDay
18%13%20%33%11%3
90
16th to endDay
35%11%20%21%11%1
90
December1st to 15thDay
20%124%43%10%1
90
16th to endDay
21%6%40%18%6%6%
96
January1st to 15thNight
13%11%35%29%10%
900
16th to endNight
15%12%38%28%4
960
February1st to 15thNight
13%8%29%33%12%1
880
16th to endNight
13%5%35%29%12%3
717
March1st to 15thNight
14%9%33%27%13%1
651
16th to endNight
18%6%29%29%11%3
576
April1st to 15thNight
11%7%38%30%11%1
539
16th to endNight
20%5%25%34%13%
540
May1st to 15thNight
22%430%30%12%
540
16th to endNight
18%6%28%34%11%
563
June1st to 15thNight
15%5%26%35%16%
540
16th to endNight
10%5%26%38%18%
540
July1st to 15thNight
7%326%37%24%1
510
16th to endNight
5%323%41%23%1
564
August1st to 15thNight
10%121%42%21%3
539
16th to endNight
8%427%37%21%1
573
September1st to 15thNight
12%326%37%17%2
540
16th to endNight
15%5%30%32%15%
516
October1st to 15thNight
18%9%33%29%8%
606
16th to endNight
18%9%30%29%11%
863
November1st to 15thNight
17%10%32%28%9%1
875
16th to endNight
17%11%37%24%6%2
900
December1st to 15thNight
15%8%32%32%10%
900
16th to endNight
19%8%32%26%10%1
960
Page generated at 2017-09-24 08:15:57. Version ac04

Copyright 2017 A. Danko


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