What parameters (such as transparency) can one attach to "predef.styles.plot"?

Dear community, I would like to be able to set particular transparency using “predef.styles.plot”, but I cannot find the parameter that would change that. Is there a page on the Internet that lists all the variables that can be attached to the above? So far I found: “color”, “lineStyle” and “lineWidth”.

Thank you, Bogdan.

Through trial and error, I figured “opacity” would work. But the question still stands whether there is an exhaustive list published somewhere.

Thank you, Bogdan.