Generally if f is configured too low, it may be causing the release tour. The answer is part of the variable y has a range that is wider than the mathematical model of JA Svestka.
If you set the f that is too small, it may cause a small tour. The disadvantage is that the answer to the variable y will have a wider range of mathematical models of JA Svestka.
If you configure f too little may cause minor tour. The disadvantage is the answer of Y variables will have a wider than the mathematical models of JA Svestka.