How to define output format for psscale (GMT 4)

  

Dear all 

I would appreciate if someone could tell me, please,
what is the choice that I must 

insert on the command line for psscale,
such that the (quite small, indeed) real numbers 

on the scale be
represented with the scientific notation instead of, for example,
0.000004, 

because the display of numbers wit many decimal digits
requires very small font sizes... 

Thanks for the kindness of your
help. 

Arlindo Arriaga 


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