.PS # parallel-series.m4 # https://tex.stackexchange.com/questions/709074/how-to-plot-a-block-diagram-with-tikz cct_init dot; line right_ dimen_/2 parallel_( parallel_( `ebox(,wdth=0.2;text="$x_1$")', `Sep=dimen_*3/4;ebox(,wdth=0.2;text="$x_2$")'), Sep=dimen_;series_( `ebox(,wdth=0.2;text="$x_3$")', `ebox(,wdth=0.2;text="$x_4$")')) line right_ dimen_/2; dot .PE