Question about drawing plots

[Chi <chi@xxxxxxxxx>]

Hi dear LAS users
    I have several time-series mooring data collected at different 
depth. say at surface,
12m and 30m.  They are not suitable for interpolation on the depth axis 
as the depth values are
sparse and not uniformly distributed.
   What I want to is, for the measured variable,  say salinity,  to draw
a plot in which the horizontal axis represents time , and the vertical 
axis represents salinity, the data
measure at surface, 12m and 30m are represented by 3 different curves 
labeled with their
depth .
   From my understanding,  if I save my data into a netcdf file with 
time and depth dimensions,
, then the default ferret script behind LAS cannot meet my requirement.
   Can anybody give me some clue? Any information will be appreciated.
    Thanks, Ding