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Please enclose the parameter name in Dollar signs and double quotes:

Info
ncl 0> f = addfile("ECMWF-data.nc","r")
ncl 1> print (getfilevarnames (f))     
(0)     longitude
(1)     latitude
(2)     time
(3)     p83.162
(4)     p86.162
 q
ncl 2> x = f->$"p83.162"$
ncl 3> print (x)
Variable: x
Type: short
Total Size: 7172160 bytes
            3586080 values
Number of Dimensions: 3
Dimensions and sizes:   [time | 31] x [latitude | 241] x [longitude | 480]
Coordinates:
            time: [1024872..1025592]
            latitude: [90..-90]
            longitude: [ 0..359.25]
Number Of Attributes: 6
  scale_factor :        0.6170104064936749
  add_offset :  -3072.290927078247
  _FillValue :  -32767
  missing_value :       -32767
  units :       W m**-2
  long_name :   Vertical integral of divergence of thermal energy flux

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