PHASING

Enter the phase subroutine by typing PH in the command line.
Move the mouse into the region of the spectrum and slide it to
the right and left (or up and down) until the baseline becomes
straight. Type Return (MAC) or Enter (PC) to exit the phase level.

Move your mouse over the sample spectrum below to see
a properly phased spectrum.

(Click on the image below to view a larger version)