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[ferret_users] strange behavior using @DIN for vertical pressure levels



Dear ferreters,

Thank you for updating v7.6 to fix the variable-variable[@AVE] shown as compressed gird problem. 

However, when I applied @DIN to variable-variable[@AVE], it still shows a very different result from variable-number. For instance:
 list/l=9 VA_4CO2_CAM3_MONTHLY_AVAV[J=9]
             VARIABLE : VA_4CO2_CAM3_MONTHLY_DIN[K=@AVE]
             LONGITUDE: 1.4W(-1.4) to 1.4W(358.6)
             LATITUDE : 65.6S
             Z (Pa)   : 500 to 103750
             TIME     : 16-SEP 00:00 NOLEAP
          85926.
  So the ave value is 85926.
Then I compare:
list/j=9/l=9 test,test7
             Z (Pa): 500 to 103750
             LONGITUDE: 1.4062W(-1.4062) to 1.4062W
             LATITUDE: 65.578S
             TIME: 16-SEP 00:00 NOLEAP
 Column  1: TEST is VA_4CO2_CAM3_MONTHLY_DIN[J=9]-VA_4CO2_CAM3_MONTHLY_AVAV[J=9]
 Column  2: TEST7 is VA_4CO2_CAM3_MONTHLY_DIN[J=9]-85926
                    TEST     TEST7
1000     /  1:  4.964E+06  4.456E+06
2000     /  2:  2.687E+06  2.179E+06
...
The results are quite different. And if I apply @DIN:
list/j=9/l=9 test[Z=1000:2000@DIN],test7[Z=1000:2000@DIN]
             LONGITUDE: 1.4062W(-1.4062) to 1.4062W
             LATITUDE: 65.578S
             Z (Pa): 1000 to 2000 (integrated)
             TIME: 16-SEP 00:00 NOLEAP
 Column  1: TEST is VA_4CO2_CAM3_MONTHLY_DIN[J=9]-VA_4CO2_CAM3_MONTHLY_AVAV[J=9]
 Column  2: TEST7 is VA_4CO2_CAM3_MONTHLY_DIN[J=9]-85926
            TEST     TEST7
I / *:     0.0000  3.317E+09
The 0 value does not make sense to me. I am wondering what happened in this process.

Thank you in advance. 
--
Xiaoyu

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