I’m trying to run SKAT genes-set association by creating single grp file of variants from ~100 genes on different chromosomes. For that I created .grp file using custom script and used in the input for ./epacts group..... It runs but EPACTs can read only markers on first chromosome. My file is sorted by increasing genomic coordinate and in the format required by EPACTs. Any idea how to make EPACTs reads markers on different chromosomes from the grp file?