a - Mark ranges in overlap region
b - Forget last "a"
c - Print cursor position
d - Replace range of pixels by straight cursor line
e - Replace range of pixels by straight data line
f - Start over from the first spectrum
j - Fudge a point to veritical cursor value
n - Go to next spectrum
o - Reset data for current spectrum to initial values
p - Do not include current spectrum in combined image
q - Carry on blindly averaging of next spectra
s - Mark ranges in current spectrum
t - Forget last "s"
v - Shift overlap average of spectrum vertically to accumulated spectrum
w - window the graph
x - Shift spectrum horizontally to cursor position
y - Shift spectrum vertically to cursor position
z - Shift spectrum vertically to accumulated spectrum
+ - Set additive scaling in vertical shifts
* - Set multiplicative scaling in vertical shifts
? - This help page