[gembud] Gray contour intervals for GDPLOT3

Hi All,

I would like to use a grayscale for contour intervals in GDPLOT3.

I specify gray tones in the FLINE= parameter as follows:

FLINE=101;=G99;=G75;=G50;=G25;24;23;4;22;21;27;26;25

However, I get only one shade of gray, as shown below:
              
Can anyone offer a solution?  

Thanks,

Mark

                                          

Attachment: gray.PNG
Description: PNG image