RLF space density evolution difference between the original and simulated sample. Left: RLF for FRI sample before and after applying the redshifting algorithm from z < 0.4 to z = 1.5. Right: RLF ratio for a sample of FRI and FRII sources before and after applying the redshifting algorithm from z < 0.4 to z = 1.5. Error bars from our RLFs are including z_max errors, Poisson errors, completeness corrections errors, and classification errors.