Difference between the potential plane distance modulus and TRGB distance modulus as a function of the TRGB distance modulus for dwarfs defining the potential plane. The horizontal dashed line marks perfect agreement. Dwarf irregulars (dIs) are marked with open circles, and blue compact dwarfs (BCDs) are flagged by solid circles. The vertical component of the error bar shows the mean uncertainty expected for potential plane distances from observational errors if the cosmic scatter about the potential plane is zero.
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