for the uninitiated you use these on your plots etc by including !fontnum_letter!X (remove underscore) i.e. xtitle=' !7l!X ' brings you to font 7(Complex greek) and the letter 'l' gives you mu as in micron.
Trace: • day5 • day10 • fall_2017 • syllabus • launch_day_2019 • ass • syllabus • first_day_plan • day7 • steve_dawson_s_diy_idl_fonts