#zdat (zcalib by M.Zolliker 2018)
#time since midnight, R ref, R meas, sigma
44383.41	35564.44	530.8807	0.0214518298
46513.41	31232.91	511.7025	0.0209242682
52708.32	26913.46	490.3765	0.020817901
56282.36	22005.14	462.4907	0.0191718805
58245.42	17884.79	434.8311	0.0153853502
60207.31	14615.57	408.9926	0.00672190449
62183.47	11937.76	383.9914	0.0095793528
70911.37	78.7532	40.36739	0.000909774697
75431.46	71.368	38.06504	0.0013435922
79771.45	65.0151	35.9957	0.00111606451
83311.45	61.9487	34.96457	0.00123927802
86343.35	60.311	34.4053	0.00117029911