Concerning the derivation of my own
graphical adaptations of the IPCC and Hadley Center source graphics, the process by which the slopes of historical CET trend lines were determined is readily evident from direct examination of the
illustration, without any
further explanation other than to clarify that all fitting of trend slopes was done by visually placing each linearized trend line onto the original HadCET source plot wherever it was appropriate in the CET record for the particular decadal rate of change being fitted: -0.1, -0.03, +.03, +0.1, +0.2, +0.3, or +0.4