...decomposition

Based on observations taken at TIRGO (Gornergrat, Switzerland). TIRGO is operated by CAISMI-CNR, Arcetri, Firenze, Italy.

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...NED

The NASA/IPAC Extragalactic Database (NED) is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the U.S. National Aeronautics and Space Administration.

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...packages

IRAF is the Image Analysis and Reduction Facility made available to the astronomical community by the National Optical Astronomy Observatories, which are operated by AURA, Inc., under contract with the U.S. National Science Foundation. STSDAS is distributed by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS 5-26555.

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...K

From Fig. 8 in BFK and assuming $A(\lambda)/A(V)$ as in Cardelli et al. (1989); these estimates have been corrected approximately for the lower dust albedo in the NIR.

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...radius

These were taken from Table 1.

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...$\langle r_{\rm e}/r_{\rm d} \rangle\,=\,0.14$

Their values have been converted to bulge effective scale lengths using the conversion factor for n = 1 given in the Appendix.

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...gradients

This could be accomplished, in principle, using np profiles or the inner part of the obseved color profiles but they are difficult to detect. Due to the seeing, the very inner color profile is hardly reliable, while at outer radii the bulge brightness rapidly falls deep below the disk.

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...respectively

We used global profiles rather than np disk profiles because the latter are not available for r-K, and because the two types of profile are very similar in J-K.

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