summary stat outputs are under summary_stat
VC_TWAS_IGAP.txt : VC_TWAS using DPR weights on IGAP summary statistics.
BGW_VC_TWAS_cis_IGAP.txt : VC_TWAS using BGW cis- weights on IGAP summary statistics.
BGW_VC_TWAS_IGAP.txt : VC_TWAS using BGW cis- and trans- weights on IGAP summary statistics.