set antialias on | off
This command, which is available in GrADS version 2.1+, allows the user to disable or enable anti-aliasing.
When using GrADS version 2.1+ with the Cairo graphics library, anti-aliasing is enabled by default. This command does not "stick" -- anti-aliasing resets to "on" with clear, reset, and reinit. For some applications it may be desireable to disable this feature, but in general anti-aliasing improves the appearance of the graphics and should be left on.