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Hi everyone, Wendy found the answer to this question, which is to use PPL COLOR to change the color of a pen This changes "pen 1" to white. ppl color,1,100,100,100 This changes it back to black (pen 1 is the one used for axes and labels, so for most plots, we don't want to leave it defined as white! ppl color,1,0,0,0 Here's the section from the Users Guide which discusses this. (In fact, you CAN use different colors for pen number 1, e.g. PPL COLOR,1,20,60,0 makes the pen a dark green rather than black.) Appendix C Sec2.3 COLOR n, red, green, blue Sets the color of a single color using the RGB color model. Specify with no arguments to reset colors 1 through 6 to their default values. These six colors are used as the line colors in line and contour plots. See "GKS line bundles" for more on line color and bundles. n color index red The intensity of red, with a value from 0 to 100% green The intensity of green blue The intensity of blue In the present version of PPL+, colors of indices 0 and 1, corresponding to the plot window background and foreground, are restricted to black (intensities all 0) or white (intensities all 100). Wendy Wang wrote: Hi all, I try to make thick white plot lines, but cannot make it work. I wonder if there is a way that is similar to making fat white contour lines. Thanks in advance for any help. Wendy Wang |