Fig. 3From: Timber identification of Autranella, Baillonella and Tieghemella in the taxonomically challenging Sapotaceae familyHeatmap showing the chemical fingerprint of the samples; each row indicates a single spectrum. The x-axis shows the m/z-value while the y-axis shows sample number; relative abundance of the ion is portrayed through intensity of color, where darker shades indicate a higher relative abundance within the sample. Vouchered specimens are indicated by arrowsBack to article page