ET AXIS/CALENDAR and SET AXIS/T0 are ignored for all except time axes.  T0 is
input in the Ferret format for date strings "dd-mmm-yyyy:00:00:00", with the hours, minutes
and seconds portion optional.  (See the command DEFINE AXIS/T0=).  UNITS are expressed as 
a string and are converted according to the usual rules for Ferret axes, see "axis, units" 
in the Users Guide. 
</LI><BR><BR>

<LI><A NAME="cancel_ax"><B>CANCEL AXIS/DEPTH axisname</B> unsets the DEPTH attribute for a 
Z axis, which may have been set