Precursor match ppm tolerance.
The polarity of data, "positive"or "negative".
"hilic" (HILIC column) or "rp" (reverse phase).
The number of candidates.
MS1 database name.
Number of threads
A mzIdentifyClass object.
The example and demo data of this function can be found https://jaspershen.github.io/metID/articles/metID.html