[ferret_users] Making a Z-plot

Hi ferret users

I am trying to make a "z-plot" that looks similar to the one shown in the bottom of Ferret "Tour" page (http://ferret.pmel.noaa.gov/Ferret/documentation/levitus-tour) using some ascii data I have.

I would like to create a plot that shows "time" in the x-axis (instead of latitude), depth on the y-axis, and then plot colors & contour lines using temperature information (just like in the mentioned Ferret Tour example).

Since the ascii file I have (attached below) has the temperature information at 10 and 0m depths for a particular lat&lon point, is there a way to represent this in "z-form" as a function of time? I guess that I am a bit confused on how to tell Ferret how to interpret the data (since it is different from a regular gridded netcdf file such as COARDS).

ASCII file contents:

A10 11/10/2013 18:20:34 20.16 27.19 654

A9 11/11/2013 14:30:35 21.34 27.69 564

A3 11/12/2013 12:10:37 20.47 27.39 652

A13 11/12/2013 14:20:38 20.34 26.69 653

A11 11/14/2013 18:30:39 20.12 26.8 653

The columns above represent:

line_#, date, time, temp_at_10m_depth, temp_at_0m_depth, daily_obs_#

set data/format=delimited/delim=" "/var="linenum,date,time,temp1,temp2"/type="text,date,time,num,num"/col=6 data3.asc

let tstep = date + time/24.

define axis/T/T0=1-jan-1900/UNIT=days ttaxis=tstep

let dummy = t[gt=ttaxis]

let var1 = reshape(temp1, dummy)

let var2 = reshape(temp2, dummy)