Figure 2
From: Metrics for evaluating the stability and reproducibility of mass spectra

Correlation matrix based on the cosine measure without smoothing. Measurements 1a and 1b correspond to different fragments of one sample classified as a glioblastoma; Measurements 2a and 2b correspond to different fragments of one sample, classified as a meningioma. The total ion current is presented for each measurement, with examples of spectra from two different scans for one of the measurements.