carried out for all extracted sources, and spurious sources were eliminated from the sample. Photometry of other bands’ images was carried out using the “double image mode”, based on the $K'$-band image. For obtaining precise color information, we applied Gaussian smoothing to $B$,$V$,F702W,$R_{\rm{c}}$,$I_{\rm{c}}$,$z'$, and $K'$ frames for matching the image qualities to that of the $J$-band, which had the worst seeing size. We set the detection criteria at 15 contiguous pixels (0”.105 pix$^{-1}$) exceeding 1.5$\sigma$ levels, and detected 235 and 164 objects with $K'\leq22.0$ for MS $0451.6-0305$ and MS $0440.5+0204$, respectively. The following results and discussions are based on the magnitudes with 2 diameter photometry, which corresponds to a linear scale of about 7 kpc and 15 kpc for $z = 0.19$ and 0.55, respectively.

The completeness of our catalog was estimated by adding artificial objects to the $K'$ images for each field at empty positions. We used the IRAF package artdata for simulating and adding point-like sources as well as objects with de Vaucouleurs and exponential profiles (convolved with the seeing PSF) onto the images. SExtractor was run with the same detection parameters as for the real data. The limiting magnitudes with 80% completeness for each field were 21.5 