The above equations can be used as an approximation though numerical algorithm will give more accurate results as the algorithm does not make any assumptions and works with arbitrary sampling distributions. One detail has to be mentioned. Special care has to be taken if the confidence region gets too close tol l 1 axis whenl l 2 is small. If it touchesl l 1 axis, then r High = '. If eitherl l 1 orl l 2 is too small, one can build respective histogram with smaller bin size to get more accurate results.