The percentile distributions of the selected metals are also presented as box and whisker plot in Fig 2. all metals were found to exhibit large variations in their minimum,maximum 25th percentile, 75th percentile and median values except for Li and Ag which showed a narrow distribution .A relatively symmetric distribution pattern was found in case of Mg,Sr,Mn and Cr thus manifesting their consistenly varying concentration in the TSP sample .Pb and Zn revealed almost similar distribution pattern while the other metals exhibited large asymmetry in their distribution (Kim et al 2002a)