  We have used the field stars from the open cluster survey BOCCE, to study
three low-latitude fields imaged with the Canada-France-Hawaii telescope
(CFHT), with the aim of better understanding the Galactic structure in those
directions. Due to the deep and accurate photometry in these fields, they
provide a powerful discriminant among Galactic structure models. In the present
paper we discuss if a canonical star count model, expressed in terms of thin
and thick disc radial scales, thick disc normalization and reddening
distribution, can explain the observed CMDs. Disc and thick disc are described
with double exponentials, the spheroid is represented with a De Vaucouleurs
density law. In order to assess the fit quality of a particular set of
parameters, the colour distribution and luminosity function of synthetic
photometry is compared to that of target stars selected from the blue sequence
of the observed colour-magnitude diagrams. Through a Kolmogorov-Smirnov test we
find that the classical decomposition halo-thin/thick disc is sufficient to
reproduce the observations--no additional population is strictly necessary. In
terms of solutions common to all three fields, we have found a thick disc scale
length that is equal to (or slightly longer than) the thin disc scale.
