inputbt.data.sample 252 Bytes
200       number of time steps
0.0008d0  dt for class A = 0.0008d0. class B = 0.0003d0  class C = 0.0001d0
64 64 64
5 0        write interval (optional read interval) for BTIO
0 1000000  number of nodes in collective buffering and buffer size for BTIO