# FedraVMC How to get OPERA F77 ntuples and organize the OperaHbook.List?

The idea of the OperaHbook.List is to have a list of root files which are obtained from OPERA F77 ntuples (produced on the level of the primary vertex) which cold be processed by the FedraVMC. There are basically two ways to get these files:

h2root neg.hbook4