For my study, I have the statistical T map for each study (format is nii). From the SDM tutorial, I only find the information about how to use text file to perform meta-analysis. Do I need to get the peak coordinates information first? Can I use statistical T map of each study as SDM input? 
When I try to perform preprocessing, it always said I need the text files.
Thank you very much.

Dear __,

you don't have to extract peaks!

If the SDM program fails to read the map, please check that the map,
- is in the folder of the meta-analysis.
- has the appropriate format. To ensure this you may use the "Convert images" button
- has the same name than the name of the study in the SDM table.

Best wishes,

Joaquim