Plot Pro default: don't use dots but just show lines?

[japhir]

The regular plot command plots lines without dots. The Plot Pro options by default plots points as well, but usually when looking at spectra these are a distraction. Perhaps change the default to no dots for plot pro, but allow the user to add them if desired?

[mingsongli]

I like this suggestion. Acycle v2.1 will use that style.