  The circumgalactic medium (CGM) is the most massive baryonic component of a
spiral galaxy, shock heated to about $10^6$K for an $\rm L^{\star}$ galaxy. The
CGM of the Milky Way has been well-characterized through X-ray absorption line
spectroscopy. However, the paucity of bright background sources makes it
challenging to probe the CGM of external galaxies. Previously, using broad OVI
absorption as a signpost, we successfully detected the CGM of one galaxy in
X-rays. Here we report on the detection of the OVII $K\alpha$ absorption line
at the redshift of a spiral galaxy at $z\approx0.225$ using 1.2 Ms of Chandra
observations. This is a robust detection, clearly showing the presence of the
hot gas. The mass in the hot phase is at least an order of magnitude larger
than that in the cooler phases detected in the UV. The presence of hot gas
$116h^{-1}$kpc from the center of this galaxy provides credence to the
existence of the extended CGM of the Milky Way. There has been a report of the
detection of OVII absorption from the warm-hot intergalactic medium in this
sightline using stacking analysis on an older dataset. We argue that the
absorption line is from the CGM of the $z\approx0.225$ galaxy instead.
