Reconstructions using 1 (top-left) to 6 (right-bottom) PCs for different H_base, obtained from our mock sample. The black (full) line represents the fiducial model ΛCDM, the brown (dotted) line corresponds to the final reconstructions in the case H_base(z) = ΛCDM, the red (full) line corresponds to the case H_base(z) = 0.5, the blue (dashed) line shows the reconstruction considering H_base = 1.0, and the green (dot-dashed) line is the reconstruction for H_base(z) = 4.0.