[gradsusr] contour plot with positive/negative values - how to set the line style for negative and positive value

[syairah atiqah atiq]

Hi how can I set the line style for positive and negative value in contour plot? Below the command that I used in my scripts

'set gxout contour'
'set csmooth on'
'set clab on'
'set ccolor 1'
'set cthick 3'
'set cint 0.2'
'set clopts -1 6 0.12'
Command that I used above, shows almost similar line for positive and negative value.Thank you in Advance.
Regards,Atiqah
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