Determine the Reference Slice for multi-band data

Hi dear professors,
 
I am a user of DPABI. Now I encounter a question when I deal with Slice Timing.
 
My question is: How could I determine the Reference Slice?
 
The parameters of my multi-band data are:
Number of Slices: 32
TR: 0.5 s
Slice Order: 0 187.5 375  62.5 250  437.5 125  312.5 0 187.5 375  62.5 250  437.5   125 312.5 0 187.5 375  62.5 250  437.5 125  312.5 0 187.5 375  62.5 250  437.5 125 312.5
 
Thanks!
 
Liang Jiali

Forums:

 I have solved this problem by myself.

You can tell us your experience. ;)

Guillaume suggests me enter 250, which means in the middle of my volume acquisition.