(Left) The difference in flux between the spectral lines illustrates whether they behave similarly in terms of intensity with respect to SXR. (Right) The difference in peak times shows whether Lyman-alpha and He II exhibit similar timing relative to the SXR emission. The top panels correspond to M-class flares, and the bottom panels to X-class flares. The red and blue dots represent flares where Lyman-alpha and He II belong to the same flare Type, while the black dots indicate flares that do not share the same classification across all EUV lines.