Spectra of Cen A GCs in the region of the Pa_β1.28 index. All spectra are presented in the rest frame and have been smoothed to a resolution of 106 km s⁻¹. Error bars are shown as vertical lines for all spectra. The black spectrum on top represents the E–MILES SSP of age 11 Gyr, at Z = −0.66, with a Kroupa-like IMF. The central bandpass of the Pa_β1.28 index, along with the blue and red pseudo-continua, are highlighted as grey and orange areas, respectively. These bandpasses are based on Eftekhari et al. (2021), with the central bandpass narrowed to 12 805–12 835 Å to avoid spectral artifacts within the index.