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   62140
   There is mounting evidence from higher-sensitivity X-ray and EUV data
   that ionized gas is present in the inner regions of BL Lacs, with low
   column densities and ionization parameters. The EUV/X-ray absorber
   represents a new and exciting component of BL Lacs, opening up the
   central regions of these objects for detailed study. We propose
   simultaneous EUVE and ASCA spectroscopy of 3 bright BL Lacs where
   evidence for intrinsic X-ray absorption was found recently. The ASCA
   observations will allow us to: (1) determine tightly the continuum to
   study EUV absorption, (2) study absorption due to ionized oxygen, and
   (3) investigate correlated X-ray and EUV flux variability.
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