how to specify solid style in -W option?

Hi,
For some reason when I use -W with no style I am getting dashed lines.
Perhaps this is remains from some other command. My question is how
can I specify solid (not dashed) style as part of -W ?

I am using  something like that

-Wthin,red,solid

and it does make solid line, but I think it's only because style definition
is not correct.

What is the right way?

Thank you!

Mikhail Tchernychev

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