Illustration of the combination of the MIUSCAT models (black line) with the IRTF based models (red solid line) between 8950 Å and 9100 Å. The blue line shows the combined model, obtained by means of a slight adjustment which we performed on the IRTF- based model spectra in order to end up with the same continuum flux as the extended MILES model spectra. The continuum fluxes were measured within the two narrow grey-shaded bands ranging from 8900 to 8950 Å and from 9100 to 9150 Å, respectively. Here, we plot model spectra of Solar metallicity and of an age of 10 Gyr, based on Padova00 isochrones. Note the significantly higher resolution of the MIUSCAT model spectrum compared to the IRTF-based one.