Figure 2
From: Color signaling in conspicuous red sticklebacks: do ultraviolet signals surpass others?
Transmission of treatment filters. Transmission spectra for the four optical filters used in the stimulus and control experiment (UV-blocking (UV-), short-wave-blocking (SW-), medium-wave-blocking (MW-) and long-wave-blocking (LW-)). Spectra were measured with an Avantes AVS-USB2000 spectrometer connected to an Avantes DH-2000 deuterium-halogen light source. Transmission was determined by attaching the reflection probe at a 90° angle to the measured filter located on a 98% white standard.