Editing Documentation:system/seismic (section)

==sffold==
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! colspan="4" style="background:#ffdead;" | Make a seismic foldplot/stacking chart. 
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! colspan="4" | sffold < in.rsf > out.rsf verbose=1 o1= o2= o3= n1= n2= n3= d1= d2= d3= label1= label2= label3=
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|  colspan="4" | <br>This is a general 3D histogram program implemented to create foldplot or<br>stacking charts on a 3d project from trace headers.  Axis1, 2 and 3 define <br>the bins for the output fold map.  These are usually (offset,xline,iline), <br>but you might want to compute some other histogram. This can be done by <br>selecting other segy headers using label1, 2 and 3.<br><br>See also fold= option in sfbin for creating 2D histograms.<br><br>EXAMPLES:<br><br>   To make a stacking chart movie showing fold(xline,offset) for each inline<br>   from a 3d segyfile:<br><br>   sfsegyread tfile=tteapot.rsf hfile=teapot.asc bfile=teapot.bin \<br>           tape=npr3_field.sgy > teapot.rsf<br><br>   # read the tfile, which contains the segy trace headers<br>   < tteapot.rsf sfdd type=float             \<br>   | sffold verbose=1                        \<br>            o1=0 n1=96  d1=200 label1=offset \<br>            o2=1 n2=188 d2=1   label2=xline  \<br>            o3=1 n3=345 d3=1   label3=iline  \<br>   >foldplot.rsf<br>   <foldplot.rsf sfgrey title=foldplot pclip=100 \<br>   | sfpen <br><br>  # transpose this data to plot foldmaps for each offset window:<br><br>  < foldplot.rsf sftransp plane=13          \<br>  | sftransp plane=12                       \<br>  | sfgrey title=foldplot_off gainpanel=all \<br>  | sfpen
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| ''float  '' || '''d1=''' ||   || 	Delta label1 - usually delta offset
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| ''float  '' || '''d2=''' ||   || 	Delta label2 - usually delta xline
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| ''float  '' || '''d3=''' ||   || 	Delta label3 - usually delta iline
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| ''string '' || '''label1=''' ||   || 	header for axis1 - usually offset
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| ''string '' || '''label2=''' ||   || 	header for axis2 - usually xline or cdp
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| ''string '' || '''label3=''' ||   || 	header for axis3 - usually iline
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| ''int    '' || '''n1=''' ||   || 	Number label1 - usually number offset
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| ''int    '' || '''n2=''' ||   || 	Number label2 - usually number xline
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| ''int    '' || '''n3=''' ||   || 	Number label3 - usually number iline
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| ''float  '' || '''o1=''' ||   || 	Minimum label1 - usually min offset
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| ''float  '' || '''o2=''' ||   || 	Minimum label2 - usually min xline
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| ''float  '' || '''o3=''' ||   || 	Minimum label3 - usually min iline
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| ''int    '' || '''verbose=1''' ||   || 	0 terse, 1 informative, 2 chatty, 3 debug
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