Small-scale deflectors. The giant, thin arc nicknamed La Flaca runs horizontally across the image. The heavy red, green, and blue curves are the critical curves of El Gordo at the redshift of the arc (z_spec = 2.8254) for the spectroscopic, Full-r and Full-a models, respectively. The Full-a model (but not the other models) includes small deflectors at the two positions marked by the white and yellow arrows. Dotted blue curves show the critical curves of the deflectors. The deflector marked with a yellow arrow has a MUSE spectrum with z = 0.7842. With a Gaussian FWHM of 024, its mass is 2.7 × 10¹⁰ M_⊙. The deflector marked with a white arrow is barely detected, and we have assumed it is at El Gordo’s redshift. With , its mass is 3.8 × 10⁹ M_⊙.