changing y-axis labels

Hi:
Is there a simple way to change the labels "Pressure" and "Height" when
using gsn_csm_pres_hgt, like if I wanted to have "ALTITUDE (km)" instead
of Height? Thanks,
Laura

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Laura D. Fowler
Mesoscale and Microscale Meteorology Division (MMM)
National Center for Atmospheric Research
P.O. Box 3000, Boulder CO 80307-3000
e-mail: laura@ucar.edu
phone : 303-497-1628
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