Table 1: Measurements derived from the spectra.
  M4 M5 M6
  value value value
  low high low high low high
position with respect to AGN [arcsec]
$\Delta\alpha$ [arcsec] 0.31 0.51 2.70 2.90 4.70 4.90
$\Delta\delta$ [arcsec] 7.02 7.22 9.76 9.96 6.80 7.00
flux densities [mJy]
R $\le$0.10 0.13 0.19 $\le$0.05
J $\le$1.21 0.79 1.88 $\le$1.01
Ks $\le$1.18 0.62 1.47 0.31 1.29
L' 0.28 3.80 0.69 3.87 1.81 7.16
10.4 $\rm ~\mu m$  0.57 3.94 41.33 62.90 37.18 57.01
11.9 $\rm ~\mu m$  20.10 47.26 78.76 130.16 109.15 169.90
12.9 $\rm ~\mu m$  91.97 169.03 208.83 341.28 379.61 575.43
12.8 $\rm ~\mu m$  77.24 128.32 183.10 287.64 264.64 421.92
6 cm 2.38 2.98 1.12 1.72 2.45 3.05
20 cm 3.04 3.64 2.44 3.04 2.24 2.84
line fluxes [10-15 erg s-1 cm2]
P${\alpha }$ 23.18 34.76 64.64 96.96 60.43 90.65
Br${\delta}$ 1.23 1.84 3.40 5.10 3.48 5.22
H2 1-0S(3) 0.71 1.07 0.96 1.44 1.29 1.94
H2 1-0S(2) 0.36 0.54 0.37 0.56 0.44 0.66
HeI 0.86 1.29 1.85 2.77 2.44 3.67
H2 1-0S(1) 1.06 1.59 1.02 1.53 1.13 1.70
Br${\gamma }$ 2.71 4.06 5.87 8.81 6.84 10.26
H2 1-0S(0) 0.38 0.57 0.43 0.64 0.52 0.78
H2 2-1S(1) 0.27 0.40 0.31 0.47 0.31 0.46
H2 1-0Q(1) 0.40 0.60 0.74 1.10 1.27 1.91
H2 1-0Q(2) 0.33 0.50 0.44 0.66 0.52 0.78
H2 1-0Q(3) 0.37 0.55 0.52 0.78 0.58 0.87
Pf${\delta}$ 38.70 58.06 35.76 53.64 59.23 88.85
Br${\alpha }$ 16.66 24.98 19.82 29.74 31.50 47.24
[ArIII] $\le$12 $\le$11 $\le$12
[SIV] $\le$6 $\le$5 $\le$5
[NeII] 110 170 440 660 570 850
aspectral indexes $F\nu\propto\nu^{-\alpha}$
$\alpha^{\rm 6~cm}_{\rm 2~cm}$ -0.49 -0.29 -0.87 -0.67 -0.54 -0.34
$\alpha^{\rm 20~cm}_{\rm 6~cm}$ -0.29 -0.09 -0.66 -0.46 -0.03 0.17

a Spectral indexes from Sandqvist et al. (1995). An uncertainty of $\pm$0.1 is added.

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