! sample MONGO plot of both alpha Boo spectra and the differences
terminal 1
erase
data gaboo4725
! read continuum level & Doppler shift for first spectrum
lines 1 2
ycol 1
set \0 y(1) ! the continuum level
set \1 y(2) ! the Doppler shift
! read & plot first spectrum
lines 3 1553
xcol 1
ycol 2
limits x(101) x(1451) -.2 1.1
box
id
set \2 x(101) - \1
set \3 x(1451) - \1
set \4 -.2 * \0
set \5 1.1 * \0
limits \2 \3 \4 \5
connect
! read & plot first difference
lines 1554 3104
xcol 1
ycol 2
connect
! read continuum level & Doppler shift for second spectrum
lines 1 2
ycol 2
set \0 y(1) ! the continuum level
set \1 y(2) ! the Doppler shift
! read & plot second spectrum
lines 3 1553
xcol 1
ycol 3
set \2 x(101) - \1
set \3 x(1451) - \1
set \4 -.2 * \0
set \5 1.1 * \0
limits \2 \3 \4 \5
connect
! read & plot second difference
lines 1554 3104
xcol 1
ycol 3
connect
end