Left panel: redshifts of quasars against [W1–W2] color. 48 282 quasars with valid redshift from LAMOST DR5 are plotted. The dashed blue line is the [W1–W2] >= 0.8 cut and dashed orange line is the fitting curve of the edge. Right panel: normalized histogram of the red-shift of quasar candidates in this work. Redshift value is extracted from SDSS DR14 (145 205 sources) and LAMOST DR5 (14 265 sources). In total, 159 470 valid redshifts of quasars are plotted.
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