[ns] how to set different transmit range for different node

[Phenix]

Hi all,

I'd like how to set different transmit range for different node in MANET.

eg.
  Three nodes,N0,N1 and N2 are in a line:
     (N0)             (N1)        (N2)
       |---  200m -----| ---120m---| 

    The transmit range of N0,N1 and N2 is respectively  250m,150m,200m.
So packets can be passed:
       N0 --> N1 <---> N2

    Let me know how to set different transmit range please.
Thank you in advance!

Regards,
Phenix