HP Data Explorer 4 Series - Manual (Page 269)

Adding and Subtracting Raw or Processed Spectra from the Same or Different Data Files (Dual
Data Explorer ™ Software User’s Guide 5-65
5
Figure 5-23 Dual Spectral Trace Arithmetic Dialog Box
6. Set the Mass Tolerance within which data points from the
different traces will be considered as the same mass.
7. Select Add or Subtract for Operation.
8. Select Add New Trace or Replace Active Trace for the
result trace.
9. Click OK.
Absolute intensities of the two traces are added or
subtracted, and the result trace is displayed with ADD
or SUB in the trace header.