text: This difference in approach led to inconsistencies in the deﬁnitions of the dates of GWLs 
  in the two parts of the study. In the extremes analysis using raw model output, the dates of 
  passing GWLs were deﬁned on the basis of the global mean temperatures in the driving CMIP5 
  models relative to those models’ simulations of global mean temperature in 1870–1899 (table 3). 
  However, in the HCVI and JULES analyses which used bias-corrected data, it was considered 
  more appropriate for the GWLs to be deﬁned using the warming in the observational dataset 