Observed and fitted spectrum of 1E 2259+586. The filled circle is the observed flux in the K_s band, and the triangles are the upper limits in the R, I, and J bands. The parameters of the blackbody+disk spectrum are R_WD = 3.0 × 10⁸ cm, T = 7.0 × 10⁴ K, T_in = 2.0 × 10³ K, and R_out = R_⊙. The blue-dashed curve is the contribution of the disk and the red-dashed curve is the contribution from a pure blackbody. The total spectrum is represented by the solid black curve.