I am attempting to create a chart with the following data:

Clear            51.4    71.0    78.4    86.5
Blue            51.9    79.3    88.7    97.3
Green            51.8    80.9    90.1    98.2
White            51.6    68.9    75.2    81.5
Red            52.7    68.9    75.2    81.5
Black            52.5    76.6    85.2    93.7
Alum Foil        51.4    63.8    69.4    76.1
Clear            51.9    72.3    78.6    86.1
Air            51.3    67.1    71.5    73.7

Elapsed Time(min)    0    45    90    240

I want to have the X-axis plotted in the relative
proportion of the Elapsed Time data.  When I do the plot,
each of the 4 numbers are the same distance apart.

Is there a way to do this.

Thanks
Dot