Directory under which all the coverages and a directory called 'info' are.
coverage
The name of the coverage we want to work with
filename
The name of the file in the coverage directory that
stores the data. By default it is called 'tol.adf'. In some cases, when
the values are stored in double precission,
the tolerances are in a file whose name is 'par.adf'.
Value
This function returns a data frame with the next fields (columns):
Type
A number from 1 to 10 showing the tolerance type.
Status
This field indicates whether the tolerance is active or not.