ODS escapechar not working for figures

[Architakamal]

Hello

This is to inform that i am currently facing an issue with assigning a superscript 'a' to the treatment header in a bar graph.

There are 4 treatments and the last treatment column of the graph contains this superscript 'a'.

I have tried with the following symbols but nothing has worked. '~', '^', '(*ESC*).

Can you kindly suggest how to program so as to represent the superscript.

Thank you 

[andreas_lds]

Please post the code you have along with data in usable form, so that we actually see what happens.