Synthetic DEM curves for Model1 (solid lines) and Model2 (dashed lines), and the DEM values derived from observations from Parenti & Vial (2007) (red dash-dotted line) and Cirigliano et al. (2004) (blue crosses). The left panel displays the synthetic DEM curves for single-thread models obtained with the LOS parallel to the magnetic field. The middle panel shows synthetic DEM curves for single-thread models obtained with the LOS perpendicular to the magnetic field. The right panel displays the synthetic DEM curves for multi-thread models each with ten randomly shifted threads.