When I use plot style filledcurves, I found it can not coexits with rgb variable. For example when I use command "plot '+' u 1:(sin($1)):(sin($2)):($1*255*255) w filledcurves lc rgb variable", I report an error message "Too many using specs for this style ". Is there any wrong with my command? Thank you!

The "filledcurves" style does not support variable color.