When & How to merge multiple eV into one .mgf file?

[DaWeMoYe]

When & How to merge multiple eV into one .mgf file?

For me, After running in MZmine3, I'v got 10eV.mgf, 20eV.mgf, 40eV.mgf. But in SIRIUS which need a merged.mgf, and I just do not know how to merge. And I tried just put these 3 mgf files into SIRIUS at the same time, but I do not sure if it was right. Please help me, Thanks very mach!