mas02md@547: \foreach \y/\col in {0/60,0.2/20,0.4/40,0.6/10,0.8/10} {
mas02md@547:   \fill[black!\col!white] ($(-0.1,0)+(0,\y)$) rectangle ($(0.1,0.2)+(0,\y)$);
mas02md@547: }