High-resolution spectroscopy of Q1100-264 again

The results of echelle spectrometry with resolution ≲9 km s^-1 of the Lyα forest region of Q1100-264 are described. The Lyα forest systems show a range of Doppler parameters from 12 km s^-1 to about 80 km s^-1, with rather large uncertainties for the low H I column density systems particularly. Few of these systems have low Doppler parameters, and there is no significant trend of Doppler parameter with H I column density, in contrast with the results of Pettini et al. from the study of a different quasar. The six heavy element systems with lines in the observed spectral region are all found to have complex velocity structure, on scales ranging from ≲10km s^-1 to ∼150 km s^-1.