Flowchart showing the data selection process, as described in Sect. 2. The final samples are 1534 objects for low-z with S/N_W3 & W4 > 5 and 309 objects for high-zS/N_W3 & W4 > 5. The low-z and high-z dataset combined create the low-high-z. High-precision datasets with Spitzer observations have 198 objects for low-zSpitzer and 91 objects for high-zSpitzer, both with S/N_W3 > 5. The datasets with different S/N_W3 & W4 cuts are analyzed in Appendix C.