Trends identified in one projection of the stellar parameter space for the group of target stars in the spur feature of the Sagittarius stream with FORS2 spectra. A large majority of the estimations of effective temperature and surface gravity for the target stars from RVSPECFIT (Koposov et al. 2011; Koposov 2019) (open star markers show estimates from fitting spectra obtained from each exposure for candBHB1 and candBHB24 for which several exposures exist) are in the range expected from bona fide BHB stars (see circles). A few outliers are marked with the numbers and more closely match the cross symbols that represent a reference dataset of blue straggler stars in the Xue et al. 2008 sample. Another outlier, candBHB25, is a likely white dwarf candidate highlighted just with an arrow because the best-fitting T_eff and log₁₀ g for both spectra are close to the upper edge of the PHOENIX grid, and are therefore not reliable. The grey marker in the upper left corner provides an estimate of the average uncertainties of the reference dataset.