whhei — Filter He I February 19, 2021 About the Filter Id: whhei Number: Release date: February 19, 2021, 12:29 pm Telescope: WIYN 3.5-meter Telescope Instrument: WHIRC Filter Details CWL (Å): 1082.00 FWHM (Å): 94.00 TMAX (%): 70.60 Filter Documents Plots He I