Topic:
How to skip traces during a seismic data load with the IES SKIPRANGE function.

Description:
The IES SKIPRANGE function will skip traces designated by the user during a
seismic data load. 

Solution:
To use skiprange, set the line, cdp, and spparameter source to expression in the 
Input Data Format window.  The function parameters and commands are:

SKIPRANGE (varibles,minexclude,maxexclude)

variables:  Any header varible (LN,CDP,SP).  This varible is what will be
	    looked at to define the conditon to skip.

Minexclude:  This is the minium portion of the range.

Maxexclude:   this is the maximum portion of the range.

Skiprange input examples:

cpd=cdp ; SKIPRANGE (CDP,58,60) -- All traces that have a cdp between and
	including 58-60 will be skipped.

sp =sp ; SKIPRANGE (SP,0,64) -- All traces that have a sp between and including
	0-64 will be skipped.  This can remove lead in edges on data.

ln=ln ;(LN,300,600) -- All traces that have a Line number between and including
	300-600 will be skipped.  This is useful when creating a volume with
	a "hole" in it so that competitors can look at some data but not more 
	sensitive data.




Last Modified on: 28-SEP-00