Table 6. Beam parameters of Yebes 40 m radio telescope.

	Main beam	1st error beam	2nd error beam	3rd error beam
Origin	Diffraction pattern	Large-scale deformations	Panel frame misalignments	Panel deformations
Correlation length		L 1 = 4.1±0.2 m	L 2 = 2.3±0.1 m	L 3 = 0.75±0.03 m
RMS-value		σ 1 = 253±20 μm	σ 2 = 245±19 μm	σ 3 = 164±12 μm
9.2mm / 32.4GHz
FWHM (θi) (″)	56 ± 5	525 ± 52	850 ± 85	2850 ± 285
Power amplitude (a i)	1	0.0022 ± 0.0006	0.00040 ± 0.00012	(1.8 ± 0.6) × 10-5
Relative Power(a) (P i)	0.75	0.14	0.07	0.04
8.1mm / 36.9GHz
FWHM (θi) (″)	49 ± 5	440 ± 44	765 ± 76	2450 ± 245
Power amplitude (a i)	1	0.0024 ± 0.0007	0.0005 ± 0.0002	(2.5 ± 0.8) × 10-5
Relative Power(a) (P i)	0.73	0.14	0.09	0.04
6.8mm / 43.8GHz
FWHM (θ i) (″)	42 ± 4	340 ± 34	620 ± 62	1900 ± 190
Power amplitude (a i)	1	0.0022 ± 0.0007	0.0012 ± 0.0004	(4 ± 1) × 10-5
Relative Power(a) (P i)	0.68	0.10	0.17	0.05
4.0mm / 74.7GHz
FWHM (θi) (″)	22 ± 2	220 ± 22	380 ± 38	1150 ± 115
Power amplitude (a i)	1	0.006 ± 0.002	0.0022 ± 0.0007	(1.2 ± 0.4) × 10-4
Relative Power(a) (P i)	0.38	0.21	0.26	0.13
3.6mm / 83.9GHz
FWHM (θi) (″)	18 ± 2	185 ± 18	355 ± 36	1050 ± 105
Power amplitude (a i)	1	0.008 ± 0.002	0.0025 ± 0.0007	(1.9 ± 0.6) × 10-4
Relative Power(a) (P i)	0.29	0.24	0.27	0.18

Notes.

^(a)The integrated relative power (P _i) of each beam is estimated as $P_i=a_{\text{i}}{\theta }_{\text{i}}^2/{\displaystyle {\sum }_{\text{i=0,3}}{a}_{\text{i}}{\theta }_{\text{i}}^2}$, see Sect. 6 of Greve et al. (1998).