[powerdot] empty slide and horizontal spacing

 I am using the "emptyslide" environment for displaying graphs (.ps pictures 
created in MATLAB) like shown in section 6.2 of  the Powerdot documentation.
 
I would like to be able to include one or two lines of text after the graph.
Have tried various combinations of hspace{} to indent the lines of text

Nothing works; only \begin{center}  works, but I would like to produce left 
justified text.

Is it possible ?

Thanks

Michel Slivitzky

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