Avoiding bias in measurements of fundamental constants from high
  resolution quasar spectra
  Recent advances in spectroscopic instrumentation and calibration methods
dramatically improve the quality of quasar spectra. Supercomputer calculations
show that, at high spectral resolution, procedures used in some previous
analyses of spacetime variations of fundamental constants are likely to
generate spurious measurements, biased systematically towards a null result.
Developments in analysis methods are also summarised and a prescription given
for the analysis of new and forthcoming data.
