VELCONV - VELocity CONVersion					

 velconv <infile >outfile intype= outtype= [optional parameters]

 Required Parameters:						
 intype=                input data type (see valid types below)
 outtype=               output data type (see valid types below)

 Valid types for input and output data are:			
 vintt          interval velocity as a function of time	
 vrmst          RMS velocity as a function of time		
 vintz          velocity as a function of depth		
 zt             depth as a function of time			
 tz             time as a function of depth			

 Optional Parameters:						
 nt=all                 number of time samples			
 dt=1.0                 time sampling interval			
 ft=0.0                 first time				
 nz=all                 number of depth samples		
 dz=1.0                 depth sampling interval		
 fz=0.0                 first depth				
 nx=all                 number of traces			

 Example:  "intype=vintz outtype=vrmst" converts an interval velocity
           function of depth to an RMS velocity function of time.

 Notes:  nt, dt, and ft are used only for input and output functions
         of time; you need specify these only for vintt, vrmst, orzt.
         Likewise, nz, dz, and fz are used only for input and output
         functions of depth.					



  AUTHOR:  Dave Hale, Colorado School of Mines, 07/07/89