Combined first-order HEG spectrum of GX 340+0 from ObsID 1922, with the best-fit model shown in cyan (see Table 1). The model is able to explain some of the features in the 4–5 keV range in terms of blueshifted absorption lines from He-like Ca XIX and H-like Ca XX. For contrast, the model shown in red includes only one absorber, and blueshifts were disallowed. The lower panel shows the ratio of the data to the best-fit model.