the mpc.branch for this file is:
%% branch data
% fbus tbus r x b rateA rateB rateC ratio angle status angmin angmax
mpc.branch = [
1 2 0.00003120 0.00007487 0.00000000 999 999 999 0 0 1 -360 360
2 3 0.00003120 0.00007487 0.00000000 999 999 999 0 0 1 -360 360
3 4 0.00009359 0.00022461 0.00000000 999 999 999 0 0 1 -360 360