Fig. 1

The spatial distribution of the four sites is superimposed on SRTM elevation data for the southern part of India (QGIS (3.4 version) — an open-source GIS software (https://qgis.org/download/)—was used for preparing the layout).

The spatial distribution of the four sites is superimposed on SRTM elevation data for the southern part of India (QGIS (3.4 version) — an open-source GIS software (https://qgis.org/download/)—was used for preparing the layout).