[Marcos Almeida]

Since Nick's remark in #11 - on the need to use Stata 15 so as to adjust the transparency, as far as I could fast check - did not get your reply, one may speculate this could be the reason for your finding that the command

doesn't change the colour intensity that is why I was asking an help

Here you have information on the availability of transparency.

[Nick Cox]

Marcos: Transparency is adjusted by % whereas intensity is adjusted by *.

Federica is trying to adjust a RGB colour by intensity. Come to think of it, that is probably contradictory.

[Marcos Almeida]

Thank, Nick, for the important remark!