Rotation measure grid evaluated from the MeerKAT Fornax Survey broadband data between 900 MHz and 1.4 GHz. The image is centered on the Fornax cluster center and goes out to a radius of 1.42 deg. Each circle represents a source with the area proportional to the source area. Top: RM mean per source. Bottom: RM standard deviation per source considering sources with cover at least three times the beam area.