Averaging spectra

To average three spectra (131, 132 and 133) type:

$\gt\!\gt$ r-g-d 131
$\gt\!\gt$ r-g-d 132; ave
$\gt\!\gt$ r-g-d 133; ave

Plot result, with

$\gt\!\gt$ n

Incidentally, note that two or more commands may be placed on one line, separated by semicolons, as shown in this example.