Synopsis
		sfpad < in.rsf > out.rsf beg#=0 end#=0

n#out is equivalent to n#, both of them overwrite end#.

Parameters
		int beg#=0 the number of zeros to add before the beginning of #-th axis   int end#=0 the number of zeros to add after the end of #-th axis

Used In
		BEI          dwnc/sigmoid ft1/brad ft1/autocor   CWP          geo2006TimeShiftImagingCondition/flat geo2006TimeShiftImagingCondition/zicig geo2007StereographicImagingCondition/gaus1 geo2007StereographicImagingCondition/sigsbee2 geo2007StereographicImagingCondition/flat4 gpr2007RWEHighOrderKernels/diving gpr2007RWEHighOrderKernels/marm jse2006RWEImagingOverturningReflections/sigsbee seg2006ConvertedWavesTSIC/cwtsic3   GEE          ajt/conv iin/miss1figs lmn/sep73 lsq/antoine mda/misif noiz/mad noiz/antoine pch/tvdecon prc/seabeam   GEOSTATS          spatial_stats/gr_variogram spatial_stats/variogram spatial_stats/covariance spatial_stats/correlogram   JSG          attr/vecta diffr/chan3d diffr/gom diffr/fault pwc/cmp shape/beivc   RSF          rsf/rsftour   SEP          angle/agmig fmeiko/tri forwd/chirp oc2/elfshot oc2/cup pwd/hector pwd/lomo pwd/dune stack/velinv stack/miginv vc2/elfvc vc2/beivc vc2/sigvc velspec/impls velspec/sigvc