Fig.3. Geo-accumulation (Igeo)of metals in sub-surface soil collected in (A) pre and (B) post monsoon season from the Faridabad industrial area [Lower line of box indicate 1st quartile i.e.
25% of the data is less than this value; middle line in box represent median or second quartile i.e. 50% data is higher than this value; upper line of box indicate 3rd or 75% quartile i.e. 25% of
data is greater than this value; upper and lower whiskers indicate maximum and minimum values excluding outliers; outliers indicate more than 3/2 times higher and lower value than
the upper and lower quartile respectively].