Program sfsmstack | Stack a dataset over the second dimensions by smart stacking. 
[SYNOPSIS]
sfsmstack < in.rsf > out.rsf s=1 l=0 ifwt=y esp=1e-10
[PARAMETERS]
float   | esp | =1e-10 |   | 	
bool    | ifwt | =y |  [y/n] | 	
int     | l | =0 |   | 	parameter for alpha-trimmed mean 
int     | s | =1 |   | 	exponent
[DIRECTORY]
user/gchliu
