Box plot with multiple fields

[Kpim]

Hi Guys

I have the following data set and I am trying to create a box plot.

City Name              Ranking                 Highest                 Lowest

Lon                              20                            35                              10

JHB                              40                           40                              20

New York                  35   

Dub                             10

I did the first box plot using City Name as dimension and Ranking as the measure.

I Tried to do the second box plot with Highest and Lowest but the box plot look exactly the same. What am I doing wrong?