Hi I have non regular data and would like to render it. 
  
  
  
The data is kilometers (x-axis) and fuel remain capacity in car (y-axis). So for example I have such data. 
  
  
  
1km - 30.0 litres of fuel 
  
5km - 29.0 litres of fuel 
  
10km - 28.0 litres of fuel 
  
50km - 24.0 litres of fuel 
  
51km - 23.9 litres of fuel 
  
  
  
I would like to render continious line chart based on those data is such way 
  
  
  
  
  
 
40 liters 
  ^ 
  |
  |+
  |      +
  |            +
  |
  |                                               ++ 
  |
  -+-----+-----+----------------------------------++--->
 1km    5km  10km                               50km
                                                  51km
 
  
  
  
I would like to render such chart. Empty cells (without value) makes the chart is not continious. I there a way to scalling in that way x-axis? On your every demo charts the diffrence in point on x-axis is always the same (constant). In this I would like to make different distances (1km point <-> 5km point, 10km point <-----------------> 50km point) 
  
I think this is clear.