17.3 Graphics environment variables

There is a wide range of environment variables which can be used to control the appearance of plots.
Most of them are assigned a values with the usual xasset command.
Note however that all variables which have a couple (or more) of numbers as values (i.e. axis-related) shall be assigned EXCLUSIVELY using command xasplot.

We provide here a list of all graphics related variables under user control (there are others which are "hidden" for internal program use), and we refer to the complete list of variables for full details. An asterisk before the variable name identifies variables which MUST be set using xasplot.
All such variables have suitable defaults. To know the setting of all graphics related variables issue command
xasplot query
There are in additions other variables which are not shown by xasplot query and can be used for purposes more related to the semantics of the plots.

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