'c'

'set grads off'

'set gxout shaded'

'set csmooth on'

* These are the BLUE shades

'set rgb 16 0 0 255'

'set rgb 17 55 55 255'

'set rgb 18 110 110 255'

'set rgb 19 165 165 255'

'set rgb 20 220 220 255'

* These are the RED shades

'set rgb 21 255 220 220'

'set rgb 22 255 165 165'

'set rgb 23 255 110 110'

'set rgb 24 255 55 55'

'set rgb 25 255 0 0'

'set clevs -300 -240 -180 -120 -60 0 60 120 180 240 300'

'set ccols 25 24 23 22 21 0 20 19 18 17 16'

'set lev 500'

'set cint 60'

'd zg(t=2)-zg(t=1)'

'cbarn'

'set gxout contour'

'set t 1'

'set cint 60'

'd zg'

'draw title 500 hPa + Variazione di geopotenziale'

'printim 10a.gif'