Data record of the relative mass of the contaminant
rat versus the filtration efficiency eps.
The elements of the vector rat must be in ascending
order, i.e., rat[i] < rat[i+1]. The vector
rat and eps have the same size.
Note that the relative mass of the contaminant rat
equals the total mass of all the contaminants captured by the
filter divided by the maximum mass of all the contaminants captured
by the filter.