**Table 4:** Format of ISOGAL "Fields'' Table (version 1) - 263 entries (see example in Table 5).
Col.	Name	Format	Units [range]	Description
1	Name	a14		ISOGAL field identifier
2	ION7	a8		ION for 7 $\mu$ m data (see Table 2)
3	ION15	a8		ION for 15 $\mu$ m data
4	filt7	i1	[2,5,6]	7 $\mu$ m filter
5	filt15	i1	[3,9]	15 $\mu$ m filter
6	pfov	i1	arcsec [3,6]	pixel field of view
7	G_lon	f8.4	deg [-180-+180]	Galactic longitude of field centre
8	G_lat	f8.4	deg [-90-+90]	Galactic latitude of field centre
9	dl	f6.4	deg	half width of field in longitude^a
10	db	f6.4	deg	half width of field in latitude^a
11	area	f6.4	deg²	area of field
12	dens7	i5	deg^-2	density of 7 $\mu$ m sources
13	dens15	i5	deg^-2	density of 15 $\mu$ m sources
14	RMS_II	f4.2	arcsec	RMS separation of 7-15 $\mu$ m associated sources
15	RMS_ID	f4.2	arcsec	RMS separation of ISO-DENIS associated sources
16	K_max1	f4.1	mag	DENIS $K_{\rm s}$ magnitude cutoff 1^b
17	K_max2	f4.1	mag	DENIS $K_{\rm s}$ magnitude cutoff 2^c
18	dens_K2	i5	deg^-2	density of DENIS $K_{\rm s}$ sources used^d

^a dl and db apply to the limits inside the edges of the images within which sources are accepted.
^b maximum DENIS $K_{\rm s}$ magnitude limiting the density of $K_{\rm s}$ DENIS sources to $\sim$ 18 000 sources per square degree if the ISO images have 6 $^{\prime \prime }$ pixels (or to $\sim$ 72 000 sources per square degree for the 3 $^{\prime \prime }$ ISO observations). K_max1 is used to discuss the quality of ISOGAL-DENIS associations (see Sect. 4.3.4).
^c maximum DENIS $K_{\rm s}$ magnitude accepted in order to avoid spurious cross-identifications. The density of $K_{\rm s}$ DENIS sources is limited to $\sim$ 36 000 sources per square degree for 6 $^{\prime \prime }$ ISO observations (and again to $\sim$ 72 000 sources per square degree for 3 $^{\prime \prime }$ ISO observations).
^d density of DENIS $K_{\rm s}$ -band sources brighter than the cutoff magnitude K_max2.

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