The function <#280#>pllab<#280#> may be called after <#281#>plenv<#281#> to write labels
on the x and y axes, and at the top of the picture. All the
variables are character variables or constants. Trailing spaces
are removed and the label is centred in the appropriate field.
The syntax for <#282#>pllab<#282#> is:
#ename446#
#eargn449#
#eargn454#
#eargn459#
More complex labels can be drawn using the function rou<#290#>plmtex<#290#>.
See also Section #graph-text#291> on page
#graph-text#292> for information about the function <#293#>plptex<#293#> which
writes labels within a graph.