Best-fit spectral parameters of RX J1605.3+3249. Data points are results from fitting the MOS and pn spectra from the XMM-Newton observations in Table 3. The spectral model corresponds to a double blackbody with two Gaussian absorption features (model (6) in Table 4). We show the best-fit temperature of the cool and hot blackbody components (left), as well as the best-fit line energies (right). Errors represent 1σ confidence level. Solid horizontal lines show results for the fit of the combined EPIC spectrum (1σ errors are displayed as dashed lines).