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ncl coordinates problem


I am running an ncl script on a wrfchem simulation but facing aproblem with coordinates. Below the output of PrintVarSummary:

Variable: u1
Type: float
Total Size: 24011520 bytes
6002880 values
Number of Dimensions: 4
Dimensions and sizes: [Time | 8] x [bottom_top | 37] x [south_north | 130] x [west_east_stag | 156]
Number Of Attributes: 6
coordinates : XLONG_U XLAT_U XTIME
stagger : X
units : m s-1
description : x-wind component
MemoryOrder : XYZ
FieldType : 104

How to convert these coordinates in lon, lat and levels in my ncl script.

Thank you