Label Sampling site   Plants Outliers Outliers ash-based
A1 Athens, Agricultural Univ. 1 Eukalyptus B,Cr,Mo,V Li, V
A2 Athens, Agricultural Univ. 1 Eukalyptus Cr, V Cr, V
G15 Laconia, Areopolis-Lagra 1 blossoms    
G25 Messinia, Kalamata 1 Orange, blossoms    
P1 Patras, city 1   Cr, Na, Pb, Sr, V Na, V
G10 Messinia, Kalamata-Avia 2 Thymian    
G6 Messinia, Kalamata-Avia 2 trees Al Al
G7 Messinia, Kalamata-Avia 2 trees/Salvia   Cu, K, P, V
G8 Messinia, Kalamata-Avia 2 Salvia    
G9 Messinia, Kalamata-Avia 2 trees    
P15 Achaia, Rogitika, Paralia 2 Orange, flowers    
G16 Laconia, Skala 3 Orange,blossoms   B, Cu, Sr
G28 Zizanio-Koroni 3 blossoms   Cd
P13 Achaia, Gomosto, Movri 3   Pb Mg
G11 Messinia, Katafygio 4 Thymian/Salvia/Trifolium    
G19 Laconia, Mani 4 Salvia, blossoms    
G21 Laconia, Mani +Sparti 4 Orange, blossoms   Co, Mo, S
G4 Messinia, Sotirianika 4 blossoms Fe, Pb Ca, Co, Cr, Fe, Pb
G5 Messinia, Stouropigion 4 Thymian    
P10 Elia, Tragana, Gargalionoi 4   Fe Mg
P4 Anatoliki-Mani 4 Phlomis    
G12 Messinia, Agios Nicon 5 Thymian/Origanum/Vicia    
G13 Messinia, Agios Nicon 5 Vicia,Thymian,Origanum Zn Cr, Fe, Mo, Zn
G26 Elia, Tropaia 5 blossoms   Sr
P6 Thermon, Agrinio 5 blossoms    
P9 Achaia, Arla, Olenia 5 Erica   Mg, P
G1 Arcadia, Leontari 6 blossoms/Orange    
G2 Arcadia, Leontari 6 blossoms    
G22 Laconia, Sparti 6 Blossoms, Eukalyptus Al, P, S  
G23 Laconia, Spartis-Skalas 6 Orange, blossoms   B, Ca, K, Mo, S, Sr
G24 Laconia, Spartis-Amyklon 6 Orange, Salvia, blossoms   B, Co, S
P18 Euboea 6 Coniferes    
P5 Lefkas island 6 Thymian/ blossoms    
P7 Kalavryta 6 blossoms Li, Mg, Mn Li, Mn
P8 Kalavryta 6 trees Li, Mn Li, Mn
G17 Laconia, Parnon 7 trees, Thymian Al  
G18 Laconia, Taygetus 7 trees, Thymian Mo  
G20 Laconia, Parnon 7 trees, Thymian Al, K, Mg, Mo, S, Sr  
G27 Messinia, Vlaseika Aipeion 7 mixed   Ca, K, Na
G3 Arcadia, Vytina 7 trees Ni, S Cd
P11 Achaia, Leontio 7      
P14 Helia, Tsipiana, Lasion 7      
P19 Achaia, Kalentzi 7   Ni Ni
P2 Karpenissi 80%, Arta 20% 7   Al, S Al
P3 Arta 7 Orange    
Table 3: Sampling sites and outliers, detected by treating each variable separately.