Combining sets of graphs with common legend

[Astrid Pineda]

I am trying to combine three sets of 2 graphs and keep one of the legends (6 graphs in total). f_distributions_sat_m, f_distributions_sat_v and f_distributions_sat_w each corresponds to a set of graphs with one legend, which were previously generated using the grc1leg command.

I am now trying this specification with the goal of keeping one common legend across the three combined graphs:

grc1leg2 f_distributions_sat_m  f_distributions_sat_v f_distributions_sat_w, ///
legendfrom(f_distributions_sat_m)  xsize(8) ysize(12) row(3)   ///
                name(graph1, replace)

I am getting the following error message:

The legend is of more than one type. This error should never occur.
invalid syntax
r(198);

(all three graphs have the same legend)

I tried using grc1leg as well and it runs, but the xsize() and ysize() options do not seem to work with this command.

Also, I know I could combine the 6 graphs using grc1leg2 but I want to have a centered subtitle for each set of two graphs. It doesn't seem possible to do this when combining the 6 graphs independently.

Any ideas on how to produce this graph are very welcome. Thank you!