Normalized contribution functions P(l | T): the “SPIRIT line set” contribution functions (left) and the XRT broadband temperature response functions (right). For the XRT response functions, the logarithmic scale is used. The labels in the right panel indicate the corresponding XRT filters: A = Al_mesh, B = Al_poly, C = C_poly, D = Ti_poly, E = Be_thin, F = Be_med, G = Al_med, H = Al_thick, I = Be_thick.