Program sfpow | Apply power gain. 
[SYNOPSIS]
sfpow < in.rsf > out.rsf tpow= pow#=(0,0,...)
[COMMENTS]

March 2013 program of the month:
http://www.ahay.org/blog/2013/03/10/program-of-the-month-sfpow/

[PARAMETERS]
float   | pow# | =(0,0,...) |   | 	power on #-th axis 
float   | tpow | = |   | 	
[DIRECTORY]
system/generic
