test file for spiff.
there is a word       here.
there is a deleted word in this line.
there is a word that is changed here.

no difference on 	this line  due to      white space.
default absolute tolerance should be 1e-10   
no difference --> 0.0           different --> 0.0
default relative tolerance should be 1e-10   
no difference --> 10.           different --> 10.00000