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. Author manuscript; available in PMC: 2019 Jan 30.
Published in final edited form as: Lab Chip. 2018 Jan 30;18(3):505–513. doi: 10.1039/c7lc01116d

Fig. 4.

Fig. 4

Frequency characterization. Left: A sequence of pressure commands was applied at 1.5 Hz to the chemical inlets. Each chemical is labeled with different concentrations of fluorescein. For visualization purposes, we represented each level of fluorescence corresponding to a different reagent with a different colour. The intensity is monitored in a region of interest located next to the animal’s nose. Right: Intensities collected for the same command of pressure sequence at different frequencies: 0.4, 0.8, 2.2, and 3.5 Hz.