EIS DEM curves for points in the quiet sun region shown in Fig. 3. Also included below each corresponding spline plot for each point in the quiet sun region are plots of the ratio of the observed intensity to the theoretical intensity for each spectral line used to constrain the corresponding DEM curve. The Fe XXIII 263.765 Å line, indicated with an arrow, is included as an upper limit. The error bars on the ratio correspond to a combination of the one sigma uncertainties on the line fitting and an uncertainty of 22% on the observed intensity based on the pre-flight calibration of EIS (Lang et al. 2006).