Program sfsum | adjoint test 
[SYNOPSIS]
sfsum < input1.rsf input2=input2.rsf input3=input3.rsf input4=input4.rsf > output.rsf
[PARAMETERS]
file    | input2 | = |   | 	auxiliary input file name
file    | input3 | = |   | 	auxiliary input file name
file    | input4 | = |   | 	auxiliary input file name
[DIRECTORY]
user/jingwei
