Table 3 Evaluation results of ten methane measurements at high pressure.

Measurement	11	12	13	14	15	16	17	18	19	20	mean	STD
\(\hat{T}\) in K	295.6	295.6	295.6	295.6	295.6	295.6	295.6	295.6	295.6	295.6	312.6	0.31
T in K	312.8	312.6	312.4	312.9	312.8	312.1	312.7	312.3	312.4	313.1
σ_T in K	1.48	2.04	1.60	1.34	1.34	1.58	2.22	1.56	1.37	1.49
σ_T,noise in K	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
σ_T,D0 in K	1.37	1.95	1.49	1.21	1.22	1.48	2.14	1.45	1.26	1.38
σ_T,if in K	0.56	0.59	0.57	0.56	0.56	0.56	0.60	0.56	0.56	0.57
\(\hat{p}\) in mbar	8732	8732	8732	8732	8732	8732	8732	8732	8732	8732	8571	32.5
p in mbar	8604	8603	8534	8577	8563	8516	8590	8559	8551	8617
σ_p in mbar	198.7	303.9	221.9	173.4	175.7	218.7	341.0	218.8	177.2	196.8
σ_p,noise in mbar	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
σ_p,D0 in mbar	197.0	301.3	220.0	171.9	174.2	216.8	338.0	216.9	175.7	195.1
σ_p,if in mbar	25.8	39.6	28.9	22.5	22.9	28.7	44.5	28.6	22.9	25.7
\(\hat{q}\) in %	22.35	22.35	22.35	22.35	22.35	22.35	22.35	22.35	22.35	22.35	24.47	0.07
q in %	24.38	24.43	24.47	24.49	24.55	24.59	24.40	24.46	24.50	24.39
σ_q in %	0.38	0.56	0.43	0.34	0.35	0.43	0.63	0.42	0.35	0.38
σ_q,noise in %	0.08	0.10	0.09	0.08	0.08	0.09	0.11	0.09	0.08	0.08
σ_q,D0 in %	0.36	0.55	0.41	0.33	0.33	0.41	0.61	0.40	0.33	0.36
σ_q,if in %	0.06	0.08	0.07	0.06	0.06	0.07	0.09	0.07	0.06	0.06

The values \(\hat{T}\), \(\hat{p}\) and \(\hat{q}\) denote the reference measurements. The value of σ gives the standard deviation of the corresponding variable and σ_noise, σ_D0 and σ_if accordingly describe the contribution of noise, wavenumber and instrument function uncertainty to σ. The column standard deviation(STD) shows the empirical standard deviation of the measurement series.

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