Fig. 2
From: Serum and plasma as a good candidates of body fluids for detection lung cancer by FTIR liquid biopsy
PCA scatter plots for FTIR spectra collected from (a1) plasma, (b1) serum in 800–1800 cm− 1 region; (a2) plasma, (b2) serum in 2800–3000 cm− 1 region. Respective loading vectors are provided in (a3), (b3), (a4), and (b4). Each black, blue, and pink symbol in a1, a2, b1, and b2 represents one spectrum.
