plot3d(Bxt(x,r),[x,0,L],[r,0,R],[legend,"Axial field"]); causes an error related to legend.
There is a bug in gnuplot_def.lisp which causes this error.
The code is to detect if [legend,false] is set or not, and if set,
unset is output as gnuplot command.
If [legend,"something"] is set, (getf plot-option :legend) returns
"something" instead of ("something"). But the code assumes the
return value is always a list, and #'first is used to the return
value, causing this error.
The fix is to check if the return value is null, which happens
only when [legend,false] is set.
The fix is already committed as [3d73ea].
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