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[ferret_users] vertical levels shifts after apply @DIN



Dear ferreters,

I have 17 levels of v-wind data. 

list/j=82/l=6 va_4CO2_MPAS_monthly_ave
             VARIABLE : VA_4CO2_MPAS_MONTHLY[X=@AVE]
             SUBSET   : 17 points (Z (Pa))
             LONGITUDE: 1.2W(-1.2) to 1.2W
             LATITUDE : 63.5N
             TIME     : 16-JUN 00:00 NOLEAP
 1000     /  1: -0.0394
 2000     /  2: -0.0227
 3000     /  3: -0.0209
 5000     /  4: -0.0252
 7000     /  5: -0.0219
 10000    /  6: -0.0125
 15000    /  7:  0.0496
 20000    /  8:  0.1512
 25000    /  9:  0.1367
 30000    / 10:  0.0665
 40000    / 11:  0.0014
 50000    / 12: -0.0065
 60000    / 13: -0.0048
 70000    / 14: -0.0037
 85000    / 15: -0.0020
 92500    / 16:  0.0645
 100000   / 17:  0.2435
I corrected the noise of it first and then applied @DIN for the vertical levels. 
list/j=82/l=6 test
             VARIABLE : VA_4CO2_MPAS_MONTHLY_AVE-0.03951
             SUBSET   : 17 points (Z (Pa))
             LONGITUDE: 1.2W(-1.2) to 1.2W
             LATITUDE : 63.5N
             TIME     : 16-JUN 00:00 NOLEAP
 1000     /  1: -0.0789
 2000     /  2: -0.0622
 3000     /  3: -0.0605
 5000     /  4: -0.0647
 7000     /  5: -0.0614
 10000    /  6: -0.0520
 15000    /  7:  0.0101
 20000    /  8:  0.1117
 25000    /  9:  0.0971
 30000    / 10:  0.0270
 40000    / 11: -0.0381
 50000    / 12: -0.0460
 60000    / 13: -0.0443
 70000    / 14: -0.0433
 85000    / 15: -0.0415
 92500    / 16:  0.0250
 100000   / 17:  0.2040
When I listed out the results I found that the vertical levels shifted 50 Pa comparing to the original data:
list/j=82/l=6 test_re, test_up, test_down2
             LONGITUDE: 1.2W(-1.2) to 1.2W
             LATITUDE: 63.5N
             TIME: 16-JUN 00:00 NOLEAP
 Column  1: TEST_RE[Z=500:103750] is TEST[K=1:17@DIN]/9.8
 Column  2: TEST_UP[Z=500:55000] is TEST[K=1:12@DIN]/9.8
 Column  3: TEST_DOWN2[Z=55000:103750] is TEST[K=13:17@DIN]/9.8
          TEST_RE  TEST_UP TEST_DOWN2
I / *:     0.04177  -27.18   27.22
Is there a reason for it? 

Thank you in advance.
-- 
Xiaoyu

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