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+Spiff compares the contents of file1 and file2 and prints a
+description of the important differences between the files. White
+space is ignored except to separate other objects. Spiff maintains
+tolerances below which differences between two floating point numbers
+are ignored. Differences in floating point notation (such as 3.4 3.40
+and 3.4e01) are treated as unimportant. User specified delimited
+strings (i.e. comments) can also be ignored. Inside other user
+specified delimited strings (i.e. quoted strings) whitespace can be
+significant.