Return solution in functions plotting scenarios

[natema]

The functions reproducing the plots internally solve the system and then only return the plot.
It would be handy to also have the solution available.
I'm not advancing any strong opinion on how this should happen (e.g. returning the solution together with the plot), but it's currently a waste to solve the system and then drop the solution away after plotting.
In trying to diagnose #67 for example, I would have liked to be easily able to inspect the solution on which the plot is based.

[paulobruno]

This brings to my mind a related question: should we make available everything that is used to build a figure?
More specifically, for each figure xx should we have functions variables_xx(), solution_xx(), system_xx() that return, respectively, the variables, solution, and system corresponding to figure xx?

[natema]

I think so.