Graphs....

Hi all,
Does anyone know if it is possible to graph your pace -vs- heartrate over time, e.g. you would be able to see how as pace increases / decreases HR fluctuates over time (days/months).  This would be helpful to be able to see how, as fitness increases, you can run/bike at a faster pace w/ the same HR.

Was wondering if this was possible, or if not, is it a possibility?

Adios
Dave