In collecting data for stars in the field of the white-dwarf/M-dwarf pair G163-50 and -51, I notice that in Landolt's 2009 standards paper he has some additional lettered stars that extend the sequence among ordinary stars. The series gives a good range in colors in a single field. However, the photometry for the star at the coordinates and chart mark for star E are incorrect. That star is about a magnitude brighter than Arlo's values. The intended star is instead about 50" due south of star B on the chart. This is confirmed by concordant values by Clem & Landolt (2013) CCD data and in Peter Stetson's 'homogeneous photometry' files. Data rounded to 0.01 precision follow.
Landolt chart star G163-51 E 11 07 22.33 -05 16 13.9 V=13.27, B-V=0.90, U-B=0.41, V-R=0.50,R-I=0.47,V-I=0.97
GSC 4927-0266 11 07 32.84 -05 13 26.2 V=14.49, B-V=0.63, U-B=0.00, V-R=0.37, V-R=0.35, V-I=0.72
Arlo made only a single observation of the second star, so his values are not precise; there is still some uncertainty between Clem & Landolt and Stetson on the U-B color. The LAMOST spectrum of the star shows type G2V, consistent with the UBV colors. FWIW, the Stetson file includes the many nights of Clem & Landolt data re-reduced and merged with numerous other datasets.
\Brian