## 4 Discussion
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Sample ID** &
\begin{tabular}{c} **Declared** \\ **Specie** \\ \end{tabular} & **Provenience** & **\% AKBA** & **\% KBA** & **\% A-BA** & **\% B-BA** & **\%A-ABA** & **\%A-BBA** \\ \hline Sch\_1 & _B. sacra_ & Oman & 4.18 & 0.27 & 1.03 & 2.72 & 2.91 & 4.86 \\ Sch\_2 & _B. sacra_ & Oman & 2.92 & 0.28 & 0.73 & 2.02 & 1.73 & 3.06 \\ Sch\_3 & _B. sacra_ & Oman & 3.44 & 0.12 & 0.41 & 1.31 & 2.07 & 3.59 \\ Sch\_4 & _B. sacra_ & Oman & 3.29 & 0.11 & 0.64 & 2.11 & 2.53 & 4.95 \\ Sch\_5 & _B. sacra_ & Oman & 3.59 & 0.22 & 1.33 & 2.94 & 3.85 & 6.23 \\ Sch\_6 & _B. sacra_ & Oman & 2.18 & 0.23 & 0.77 & 2.48 & 1.69 & 3.12 \\ Sch\_7 & _B. sacra_ & Oman & 3.75 & 0.16 & 0.76 & 2.24 & 2.72 & 3.85 \\ Sch\_8 & _B. sacra_ & Oman & 3.33 & 0.21 & 0.67 & 1.82 & 1.90 & 3.24 \\ Sch\_9 & _B. sacra_ & Oman & 2.61 & 0.10 & 0.58 & 1.91 & 2.31 & 4.45 \\ Sch\_10 & _B. sacra_ & Oman & 2.18 & 0.11 & 0.47 & 1.86 & 1.88 & 3.99 \\ Sch\_11 & _B. sacra_ & Oman & 3.01 & 0.12 & 0.46 & 1.38 & 2.37 & 3.67 \\ Sch\_12 & _B. altzielli_ & Burkina Faso & 5.34 & 1.17 & 1.33 & 1.74 & 2.73 & 3.14 \\ Sch\_13 & _B. altzielli_ & Nigeria & 7.22 & 0.99 & 1.62 & 2.03 & 3.92 & 3.80 \\ Sch\_14 & _B. altzielli_ & Senegal & 6.83 & 1.39 & 1.61 & 1.68 & 2.97 & 2.81 \\ Sch\_15 & _B. parynxifera_ & Ethiopia & 4.39 & 0.44 & 1.09 & 2.36 & 2.14 & 3.00 \\ Sch\_16 & _B. puryifera_ & Eritrea & 2.78 & 0.34 & 0.55 & 1.64 & 1.43 & 1.99 \\ Sch\_17 & _B. puryifera_ & Senegal & 1.68 & 0.32 & 1.03 & 3.18 & 2.02 & 4.65 \\ Sch\_18 & _B. serra_ & India & 1.13 & 0.53 & 1.64 & 4.97 & 1.17 & 3.65 \\ Sch\_19 & _B. serra_ & India & 1.87 & 2.23 & 2.53 & 4.97 & 1.17 & 3.06 \\ Sch\_20 & _B. serrata_ & India & 1.36 & 0.31 & 1.56 & 4.79 & 1.62 & 4.19 \\ Sch\_21 & _B. serrata_ & India & 0.86 & 0.58 & 1.32 & 5.40 & 0.74 & 2.31 \\ Sch\_22 & _B. serrata_ & India & 1.33 & 0.98 & 1.53 & 4.27 & 1.01 & 2.94 \\ Sch\_23 & _B. serrata_ & India & 0.93 & 0.63 & 0.89 & 2.83 & 0.62 & 1.98 \\ Sch\_24 & _B. serrata_ & India & 0.81 & 0.40 & 1.22 & 3.83 & 0.84 & 2.36 \\ Sch\_25 & _B. carteri_ & Somalia & 0.01 & 0.01 & 1.18 & 3.81 & 1.95 & 4.64 \\ Sch\_26 & _B. carteri_ & Somalia & 0.01 & 0.00 & 1.55 & 5.73 & 3.38 & 8.46 \\ Sch\_27 & _B. carteri_ & Somalia & 0.00 & 0.01 & 2.89 & 6.67 & 0.00 & 0.01 \\ Sch\_28 & _B. carteri_ & Somalia & 0.00 & 0.09 & 3.65 & 8.39 & 0.00 & 0.01 \\ Sch\_29 & _B. carteri_ & Somalia & 4.93 & 0.65 & 2.07 & 1.81 & 1.74 & 2.55 \\ Sch\_30 & _B. neglecta_ & Somalia & 0.00 & 0.14 & 2.68 & 8.10 & 0.08 & 0.37 \\ Sch\_31 & _B. neglecta_ & Somalia & 0.01 & 0.16 & 2.67 & 7.58 & 0.26 & 1.31 \\ Sch\_32 & _B. neglecta_ & Somalia & 0.00 & 0.17 & 2.98 & 8.59 & 0.06 & 0.43 \\ Sch\_33 & _B. neglecta_ & Somalia & 0.01 & 0.06 & 2.48 & 7.36 & 0.18 & 0.71 \\ Sch\_34 & _B. neglecta_ & Somalia & 0.00 & 0.02 & 0.72 & 2.06 & 0.05 & 0.26 \\ Sch\_35 & _B. neglecta_ & Kenya & 0.00 & 0.01 & 0.19 & 0.32 & 0.01 & 0.08 \\ Sch\_36 & _B. neglecta_ & Kenya & 0.00 & 0.01 & 0.01 & 0.01 & 0.01 & 0.01 \\ Sch\_37 & _B. rivae_ & Ogaden & 0.01 & 0.00 & 0.01 & 0.03 & 0.01 & 0.02 \\ Sch\_38 & _B. rivae_ & Somalia & 0.01 & 0.01 & 0.01 & 0.01 & 0.01 & 0.01 \\ Sch\_39 & _B. rivae_ & Somalia & 0.01 & 0.01 & 0.01 & 0.01 & 0.01 & 0.01 \\ Sch\_40 & _B. rivae_ & Somalia & 0.01 & 0.01 & 0.01 & 0.01 & 0.01 & 0.01 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Table listing all the samples used for the meta-multivariate approach. Each row reports the sample ID on the first column; declared species reports sample species, with “unk” if unknown; provenience reports the national or territorial origin of the sample, with “unk” if unknown. The remaining column reports the concentrations of each boswellic acid studied expressed as weight percentage or g/100 g. All the quantitation data are obtained from [21]. such as AKBA and other terpenes by using, respectively, TLC and mass spectrometry (MS) and nuclear magnetic resonance spectroscopy (NMR). An interesting approach was used by MALDI TOF fingerprinting analysis to perform the identification of commercial frankincense [24].