How to mamage the size of the legend key marker independently of scatterpolt msize() option

[Mik Sokol]

Dear experts,
I am trying to make a scatterplot consisting of 4 groups of dots which make 4 lines. I would like to keep these "lines" as thin as possible so in the scatter definition I indicated the option msize(vtiny). You can see the plot as a first attachment, ds_by_dy.jpg.
The negative side is that in the legend key Stata also plots marker as it is defined in the scatter command, in my situation - very tiny, which is almost impossible to see in the legend. I am sure I can do this using graph editor:
start graph editor -> go to legend dropdown list on the right side of the screen -> click legend -> click key region -> right click key[whichever you need] -> in the key properties window select Size: medium (see attachment #2, lc_ear2).
The question is: how to do this in code? Again: I want only the legend keys to be changed, the ones on the scatterplot must remain very tiny.
Sincerely,
Mik

[Chen Samulsion]

Well, you can 'deceive' Stata using the following code (suppose you using stcolor scheme, or else you must modify mcolor option). The original method is here: Re: st: key symbol size in legend https://www.stata.com/statalist/arch.../msg00253.html

set obs 1000
gen xvar=runiform()
gen bq1=chi2den(5,x)
gen bq2=chi2den(7,x)
gen bq3=chi2den(9,x)
twoway scatter bq1 bq2 bq3 xvar, msize(vtiny vtiny vtiny) || scatter bq1 bq2 bq3 xvar if xvar==., mcolor(stc1 stc2 stc3) legend(order(4 5 6))

[Mik Sokol]

Great idea, thank you! It worked fine.
Mik