Each observing condition is characterised by a percentile that represents the frequency of occurrence of the specific property. In the tables that follow, if the characteristic extends across more than one percentile bin please select the largest appropriate percentile. The values are subject to change. An important aspect of telescope commissioning will be to verify and, if necessary, update these models. These values are expected to improve as thermal control of the facility is optimised.
All values pertain to telescope pointing at zenith .
Precipitable H 2 O. See spectra . The atmospheric absorption is strongly wavelength dependent as shown in model transmission spectra . Percentiles are based on long-term data for Mauna Kea . The maximum air mass should be specified in the technical justification section of your proposal.