Correction to: The Tree Drought Emission MONitor (Tree DEMON), an innovative system for assessing biogenic volatile organic compounds emission from plants

Screening study with cluster analysis. a Average total monoterpene emission rates of each screened sweet chestnut seedling standardized to 30 °C and 1000 μmol m？2 s？1 and corresponding cluster (1–3) assignment calculated by using PAM (partitioning around medoids) method. Error bars represent the standard error. b Compound emission composition of each single tree (see ID) with corresponding clusters (1–3) calculated by PAM (see also for cluster diagnostic Additional file 1: Fig. S5