A new implementation of the infrared flux method using the 2MASS catalogue

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Table 2:

Coefficients and range of applicability of the $\phi$ :(V-m)-[Fe/H] calibrations.
Colour	Colour range	[Fe/H] range	a₀^a	a₁	a₂	a₃	a₄	a₅	a₆	N^b	$\sigma_\phi(\%)^{c}$
Dwarf stars
V-J	[0.8, 2.4]	[-3.5, 0.3]	2.4945	-2.2635	0.9615	-0.1509	0.0657	-0.1365	-0.0074	219	0.9
V-H	[0.9, 3.0]	[-3.5, 0.3]	2.3681	-1.9055	0.6415	-0.0773	0.0418	-0.1028	-0.0053	216	0.9
$V-K_{\rm s}$	[1.0, 3.0]	[-3.5, 0.3]	2.3522	-1.8817	0.6229	-0.0745	0.0371	-0.0990	-0.0052	216	0.9
Giant stars
V-J	[0.5, 2.7]	[-4.0, 0.1]	2.2282	-1.7818	0.6809	-0.0923	0.0302	-0.0696	-0.0031	97	1.3
V-H	[0.6, 3.4]	[-4.0, 0.1]	2.1522	-1.5792	0.4821	-0.0523	0.0182	0.0502	-0.0019	91	1.3
$V-K_{\rm s}$	[0.7, 3.8]	[-4.0, 0.1]	2.1304	-1.5438	0.4562	-0.0483	0.0132	0.0456	-0.0026	95	1.4

^a The coefficients of the calibrations a_i are given in units of 10^-5 erg cm^-2 s^-1.
^b N is the remaining number of stars after several iterations (usually less than 20) of the 2.5 $\sigma$ clipping.
^c $\sigma_\phi$ , given in per cent, is the standard deviation of the final calibrations.

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