Emission measure, EM, of shocked Fe (red) and Si (green) integrated along the y-axis (i.e., the LoS assuming the vantage point at Earth), and column density, n_Ti, of Ti (both shocked and unshocked; blue) at the age of Cas A for our three models. The solid contours mark cuts of the forward andreverse shocks in the plane of the sky passing through the center of the explosion; the dashed lines mark the same cuts but for spheres with the centers coincident with the center of explosion and radii corresponding to the average radii of the forward and reverse shocks. The two crosses in each panel mark the center of the explosion and the geometric center of the forward and reverse shocks offset to the northwest.