Hi, I have a question about Matpower 4.0

By running" runpf('case9') " I get the power flow of the 9-bus system.
  If I change baseMVA from 100 to 1000 or 10 in file 'case9.m', 
  the results of power flow do change completely!  Why?
  Is this because the r, x and b columns are expressed by p.u.-values?
  If so, how do I have to transform them in order to receive the same 
  results as before? How do I choose a baseMVA value for an unknown 
System?
  Thanks very much

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