Mock spectra of the “full length” region of J1214+2712. Top panel: Mock data (grey crosses) and best-fit model (black solid line). Components of the model are also shown (WHIM in red solid line, CXB in blue dashed line, MWH in cyan dashed line, and LHB in orange dashed line). Bottom panel: Zoom-in spectra of the WHIM (red solid line) and the total background (blue dashed line) with prominent emission lines labeled.