Figure 1

Graphical representation of Spearman correlation matrix of 130 surface-enhanced laser desorption/ionization time-of-flight mass spectrometry peaks. Red color intensity, positive correlation; green color intensity, negative correlation.
Graphical representation of Spearman correlation matrix of 130 surface-enhanced laser desorption/ionization time-of-flight mass spectrometry peaks. Red color intensity, positive correlation; green color intensity, negative correlation.