public static void Write3(List<GroundLine.CrossSection> firsList, string filename)

        {

            StreamWriter file = new StreamWriter(filename);

            for (int i = 0; i < firsList.Count; i++)

            {

                file.WriteLine("    " + firsList[i].Stake.Value + "    " + firsList[i].Elevation);

                KeyValuePair<double, double>[] leftlist2 = firsList[i].LeftList.ToArray();

                string leftList1 = "";

                double left = 0;

                double laft = 0;

                for (int m = 0; m< leftlist2.Length; m++)

                {

                    double aleva = firsList[i].Elevation;

                    laft = (aleva + leftlist2[m].Value) + laft;

                    

                    double eleva = leftlist2[m].Key;

                    if (m == 0)

                    {

                        left = eleva;

                    }

                    if (m < leftlist2.Length - 1)

                    {

                        left = left + leftlist2[m + 1].Key;

                    }

                    else

                    {