Photodesorption spectra for masses 30, 32, 44, and 46 in molecule/photon from pure methanol ice at 15 K, with the associated molecules. The measurements at fixed energy are represented by the squares with error bars. The scan experimentsare represented by solid lines. The TEYs measured during the scan experiments are also shown as dashed lines in arbitrary units. Information about the fluence received by the ice before each measurement is displayed in the bottom panel.