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The Structure of High Redshift Galactic Halos

Observations of multiple or lensed QSOs at high redshift can be used to probe transverse structure in intervening absorption systems. Here we present results obtained from STIS spectroscopy of the unique triply imaged QSO APM 08279+5255 at z em = 3.9 and study the coherence scales of intervening low and high ionization absorbers.