David, 

You asked: " ... but don't see how to get the time difference ...". 

1. Create a channel in your GDB (dummytime).
2. Go to X-Utility > Expressions > Expression: 
    type: "dummytime=time-time". 
    This will place zero at each point in the new "dummytime" channel.
3. Go to Utility > Make distance channel: In the dialogue box:
    For "Existing X channel: type "time"
    For "Existing Y channel: type "dummytime"
    For "Output distance channel: type "timediff"
    
    This would calculate the differences of each point in the time channel
    and place them in the timediff channel.

Hope this helps, David!

To: Tom Cutbertson of Geosoft: While we are brainstorming this subject,
could we place this as a feed back to implement a GX (e.g. Make difference
channel) in the up coming versions of the Oasis montaj? I am sure it would
be just a minor modification to the existing "Make distance channel" GX.


Nice weekend everyone,
mansour

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