Fabrice Couvreur schrieb am 23.09.2019 um 23:31:
> Hi Wolfgang,
> As I understand it, the following instructions have no effect on the 
> figures
>
> defaultfont := "texgyrepagella-regular*default" ;
> defaultscale :=0.8 ;

You change the font because you typeset your labels in math mode.

label.llft(btex \m{O} etex,origin) ;

Wolfgang