Fitted spectra for Flare 1 using the brightest pixels for Footpoints 1 and 2 – plots a) and b) respectively. For both spectral profiles the total fit and data is shown in black solid and dashed lines respectively. The calibrated 1σ errors on each data point are also plotted including the reduced χ² value for the fit. The oxygen lines forming the diagnostic ratio are plotted in red in both columns, with the various blends described by the legend.