Editing Revisiting SEP tour with Madagascar and SCons (section)

===Normal Moveout===
The next example applies a simple constant-velocity NMO correction to the
windowed data
and pipes the result to a wiggle plotting command:
<syntaxhighlight lang="python">
Result('nmo','windowed',
       '''
       nmostretch v0=2.05 half=n |
       wiggle pclip=100 max1=0.6 poly=y
       ''')
</syntaxhighlight>

Running <tt>scons -Q nmo.view</tt> produces 
<pre>
< windowed.rsf /path/to/RSF/bin/sfnmostretch v0=2.05 half=n | 
/path/to/RSF/bin/sfwiggle pclip=100 max1=0.6 poly=y > Fig/nmo.vpl
/path/to/RSF/bin/sfpen Fig/nmo.vpl
</pre>
Note that SCons does not recreate the
<tt>windowed.rsf</tt> file if that file is up to date. You can
experiment with the NMO velocity (2.05~km/s) or with plotting
parameters to get different results. As Dellinger and T&#225;las (1992<ref>Dellinger, J. and S. T&#225;las,  1992, A tour of SEPlib for new users, ''in''  SEP-73,  461--502. Stanford Exploration Project.</ref>)
point out, the NMO velocity of 2.05~km/s "appears to split the
difference between two distinctly non-hyperbolic shear waves".
[[Image:nmo.png|frame|center|To see this figure on your screen, run <tt>scons nmo.view</tt>]]