Here's an idea for how to quickly use the interact
option to overlay some picked lines.

run xtpen with the interact option. click on points,
they get saved in coord.out:
Ta2vplot < spike.T | Tube interact=coord.out

convert this to a seplib file:
atoF < coord.out > annot.H

Graph these points in a separate plot. I use crowd
to take up the entire screen (because the coordinates
in the interact file are in inches), and turn off all the
annotation. This example connects just two points.
If you have more, and want them connected in one
continuous line, this will work (just change n1).
If you want them done as separate segments, maybe you
can do that by making n1=2 n2=x?
Graph n1=2 n2=1 esize=8 crowd=1 min1=0 max1=13.65 min2=0 
    max2=10.24 wanttitle=n < annot.H > /dev/null out=annot.v

Plot the original plot and overlay with no erase in
between:
Ta2vplot < spike.T | Tube > /dev/null out=spike.v
tube erase=n spike.v overlay.v | tube

This is all kind of approximate and not rigorously
tested, but it will get you in the ballpark.
Good luck.




From scole@chevron.com  Mon Sep 21 09:00:29 1998
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Date: Mon, 21 Sep 1998 08:59:16 -0700 (PDT)
From: Steve Cole <scole@chevron.com>
To: Matthias Schwab <matt@kana.Stanford.EDU>
Subject: Re: your mail
In-Reply-To: <199809210808.BAA14225@kana.Stanford.EDU>
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There is an option in all the pen filters, interact=,
you give a file name, and when you click on the screen,
the coordinates are recorded in a file.
I haven't used it in quite some time but I've used
it for things like that. I might be able to find
an example, but try it out and see if it does
what you want.

-----------------------------------------------------------------
Steve Cole                                      scole@chevron.com
Chevron Petroleum Technology Co.              Tel: (562) 694-7157
P.O. Box 446, La Habra, CA 90633-0446         Fax: (562) 694-7063

On Mon, 21 Sep 1998, Matthias Schwab wrote:

> I want to pick a few events in a seismic section and overlay 
> a the picked lines over the rasterplot. How do I do that best? 
> Is there a picking routine (xtpanel) that gives an output that
> is easily transformed into a vplot figure. I am thinking of a
> routine that spits out coordinates of the picked points which
> I then can feed to Graph to produce a vplot figure that connects
> the points by lines. Ultimately, the picked event vplot and the
> original migrated image are superposed. Any idea or suggestion? 
> I will not pick many points (maybe 100 total, so a less sophisticated
> picking method is satisfactory. Thank you again for your help. 
> 
> 	Matthias
> 

