Comment on "An X-ray chimney extending hundreds of parsecs above and
  below the Galactic Centre" (2019, Nature, 567, 34)
  A recent article "An X-ray chimney extending hundreds of parsecs above and
below the Galactic Centre" (2019, Nature, 567, 34) reported the detection of
chimney-like X-ray-emitting features above and below the Galactic Center from
XMM-Newton observations. We note here that these features were already reported
by our Suzaku papers: Nakashima et al. (2013, ApJ, 773, 20, arXiv:1310.4236)
for the southern feature and Nakashima et al. (2019, ApJ, in press,
arXiv:1903.02571) for the northern feature. In particular, Nakashima et al.
(2013) show that the ionization state of the southern feature is not in
collisional ionization equilibrium and is most likely in a recombining or
over-ionized state, which suggests its origin in the Galactic Center about 0.1
Myr ago.
