Stress mark in a graph

[Leticia Peña]

Hi there,

I can't manage to add stress marks in legends/titles/labels in graphs.

For instance, I would like to title a graph as:
    "Corrección"
but I can only get
     "Correccion"
as result :(

Could anyone help me? I need these graphs for my final dissertation and I am Spanish, so I do need legends/titles/labels in graphs to be written correctly...

I would highly appreciate your help.

Kind regards,

Leticia