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README file for "Set IV" data tables

This dataset summarizes the main photometric quantities and the detailed monochromatic effective number of stellar contributors [N(eff)] for the Simple Stellar Population (SSP) models.
Credit to these models should be acknowledged referring to:

Buzzoni, A.: "Statistical properties of stellar populations and surface-brightness fluctuations in galaxies", 1993, Astron. Astrophys., 275, 433.

The quantity N(eff) has much to do with the entropy status of a SSP and with the expected statistical fluctuations of its integrated photometric properties (colors and magnitudes). This statistical approach directly complement the Tonry & Schneider (1988, AJ, 96, 807) theory and can be fruitfully applied to assess surface-brightness fluctuations in galaxies.
To properly use these data, the user is strongly encouraged to read first the Buzzoni (1993) work as well as the detailed discussion carried out by Cerviño et al. (2002, A&A, 381, 51).

Each table begins with a header reporting the general quantities for each SSP and its integrated Johnson colors, exactly as in the Set II data (please refer to the Set II Readme file for further info).

The effective number of stellar contributors [N(eff)] for SSP models is given in the following big block of data.
The tables always give entries for Age = 18, 15, 12.5, 10, 8, 6, 5, 4, 3, 2 Gyr (or Age = 15, 12, 9, 6 Gyr for the case of Z = 0.1), respectively. If a given age has not been computed, then entries are set to 0.000 (this is the case, for example, of the missing 18 Gyr models for Red HB SSPs with Z ≥ 0.01). The value of log_10 (N_eff), computed for the 342 wavelength points and always normalized to a total bolometric luminosity of 1E10 L_sun results in a column, consisting of 342 wavelength entries. Wavelength, in Å, is given in the first (left) column; it ranges from 229 to 200,000 Å with variable step.

AB/Jul 2004
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