   ZO may have multiple elements along its 3rd, 4th, or 5th dimension.  Z
    will then have its first two dimensions matching LAT and LON, and
    higher dimensions matching ZO.  
 
    Z=<a href="interplatlon.html">INTERPLATLON</a>(LATO,LONO,[],ZO,LAT,LON,[],BOOL), where BOOL is a
    boolean array with size SIZE(LAT), sets the corresponding entries of 
    Z to NaNs.  BOOL could for example be true over land.  If Z has more
    than 2 dimensions, this is done for each SIZE(LAT) element of Z.
    ________