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Instrument description The VenSpec-U instrument is a dual channel UV spectral imager (low and high spectral resolution channels, "LR" and "HR" hereafter), part of the VenSpec spectrometer suite on board the proposed Venus orbiter EnVision. Each channel consists of an entrance baffle, an objective composed of two lenses and a stop diaphragm, and a spectrometer composed of a slit and a toroidal holographic grating. It also includes s shortpass filter to reject the wavelengths above the higherdoi:10.5194/epsc2020-622 fatcat:iqi4lx3uxffrpixhwae6aga5c4