Space weathering spectral alteration effects simulated by laser irradiating meteorites. (a) Reflectance changes with wavelength. The solid lines represent unirradiated spectra, and the dashed lines represent irradiated spectra. (b) The diagram plotted by reflectance at 0.55 µm (R_0.55) and the spectral slope calculated in the 1.1–1.4 µm band (S₅). The solid symbols represent unirradiated meteorites, and the open symbols represent irradiated meteorites. The arrows point from unirradiated to irradiated samples, reflecting the trend of data point migration caused by laser irradiation. We note that the dashed line marked “trendline” is a virtual extension line of the black arrow.