PYGMT / subplot&subsize

I want to generate a figure with 3 plots. I am using subplot to create 2 row and 2 columns.
I just want to fix the size of each row/columns to be for exemple :

  • 10c for the first row
  • 5c for the second row
  • 10c for the first column
  • 5c for the second column.
    But I did not succeed to do that with subsize option in suBplot, assuming I am doing something wrong but can’t find sufficient information on the pygmt help site…

If anybody has a good idea, I will be glad.