set label "P_{11}" at 1,1,1+y_offset font "Helvetica Bold"
If I instead omit the undersocre (subscript) it works fine:
set label "P11" at 1,1,1+y_offset font "Helvetica Bold"
Is it not possible to make text with latex subscripts bold?
What do you mean by "latex subscripts"? What terminal type are you using?
Could you post a minimal gnuplot script that demonstrates your problem?
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Lionel B