Ah alright 
Histo1D does not accept expressions, just column names. Define is the right thing to use in this case. It’s a bit more verbose but it keeps responsibilities clearly separated.
Cheers,
Enrico
Ah alright
Histo1D does not accept expressions, just column names. Define is the right thing to use in this case. It’s a bit more verbose but it keeps responsibilities clearly separated.
Cheers,
Enrico