Table 6: Numerical values for the example of Sect. 4.2 (see also Fig. 2). The upper table lists the input line-strength indices employed in the computation of the bivariate polynomial transformations in Figs. 2a, c around the model predictions for a SSP of 12 Gyr with solar metallicity (boldfaced). The lower table displays the different parameters involved in the calculation of the previous transformations, and the factors leading to the suitability index in Eq. (21).
Line-strength indices from BC01
    [Fe/H]
    -0.330 0.093 0.059
  8 Gyr 0.749313 0.888150 1.062612
$\tilde{\rm D}_{4000}$ 12 Gyr 0.819419 0.966693 1.135206
  20 Gyr 0.887191 1.056064 1.197137
  8 Gyr 0.077433 0.069191 0.060212
H$\beta $ 12 Gyr 0.068105 0.060252 0.052139
  20 Gyr 0.060212 0.051545 0.044401
  8 Gyr 0.039794 0.071434 0.118949
Fe4668 12 Gyr 0.043234 0.076271 0.129336
  20 Gyr 0.045004 0.081293 0.142160

  diagram Eq.
parameter H$\beta $-Fe4668 $\tilde{\rm D}_{4000}$-Fe4668 reference
p10 -0.430095 -0.430095 (C.2)
p11 0.051432 0.051432 (C.2)
p20 0.040343 0.040343 (C.2)
p01 0.323917 0.323917 (C.2)
p02 -0.014719 -0.014719 (C.2)
q10 -0.058764 0.488931 (C.2)
q11 0.003947 -0.013260 (C.2)
q20 0.002449 -0.013883 (C.2)
q01 -0.717729 4.921280 (C.2)
q02 0.033402 -0.225252 (C.2)
log[age] 10.079182 10.079182 (C.2)
log[Z] 0.093200 0.093200 (C.2)
a11 0.095814 0.095814 (16), (C.2)
a12 0.031999 0.031999 (16), (C.2)
a21 -0.018528 0.352696 (16), (C.2)
a22 -0.044036 0.379328 (16), (C.2)
c(m1) 0.2757 0.1086 (21)
c(m2) 0.2235 0.2235 (21)
$\kappa $ 16.995 0.9685 (21)


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