Been crunching the numbers and trying to find a concise way of expressing the results in graphical form.  Try these on for size:

Graphs are separated into pairs, one for Peak, one for Off-peak, shown from each zone by destination zone and fare scale:

Z1-Peak

Z1-Offpeak

Z2-Peak

Z2-Offpeak

Z3-Peak

Z3-Offpeak

Z4-Peak

Z4-Offpeak

Z5-Peak

Z5-Offpeak

Z6-Peak

Z6-Offpeak

 
Set your Twitter account name in your settings to use the TwitterBar Section.