  We present a tomographic analysis of metal absorption lines arising from the
circumgalactic medium (CGM) of galaxies at z~0.5-2, using Multi Unit
Spectroscopic Explorer (MUSE) observations of two background quasars at z~2.2
and 2.8, which are two of the few currently known quasars with multiple images
due to strong gravitational lensing by galaxy clusters at z~0.6 and 0.5,
respectively. The angular separations between different pairs of quasar
multiple images enable us to probe the absorption over transverse physical
separations of ~0.4-150 kpc, which are based on strong lensing models
exploiting MUSE observations. The fractional difference in rest-frame
equivalent width (Delta Wr) of MgII, FeII, CIV absorption increases on average
with physical separation, indicating that the metal-enriched gaseous structures
become less coherent with distance, with a likely coherence length scale of ~10
kpc. However, Delta Wr for all the ions vary considerably over ~0.08-0.9,
indicating a clumpy CGM over the full range of length scales probed. At the
same time, paired MgII absorption is detected across ~100-150 kpc at similar
line-of-sight velocities, which could be probing cool gas clouds within the
same halo. No significant dependence of Delta Wr is found on the equivalent
width and redshift of the absorbing gas and on the galaxy environment
associated with the absorption. The high-ionization gas phase traced by CIV
shows a higher degree of coherence than the low-ionization gas phase traced by
MgII, with ~90 percent of CIV systems exhibiting Delta Wr <=0.5 at separations
<=10 kpc compared to ~50 percent of MgII systems.
