Erratum: New SX Phe variables in the globular cluster NGC 288★

In fig. 9 of Martinazzi et al. (2015), the period–brightness relations are indicated by the dashed lines. The brightness is given in terms of the average magnitude in the V band and the periods in days. We use Arellano Ferro et al. (2013), who adopted the SX Phe PL relation derived by Arellano Ferro et al. (2011) in M 53. Using the periods of V4–V8 identified in Table 2 as fundamental periods and the five identified as harmonics in V4 and V7 [using Pk/(k + 1)] we obtain the period–brightness relations: equation (3): V = (−2.59 ± 0.18) log P0 + (14.38 ± 0.23).