function Sep23()

% The integral of Bstar from -2 to -1 equals 1/24
% The integral of Bstar from -1 to  0 equals 11/24
% The integral of Bstar from  0 to  1 equals 11/24
% The integral of Bstar from  1 to  2 equals 1/24



% The integral of B_{0}(z) from x(1) to x(2) is
% The integral of B_{1}(z) from x(1) to x(3) is
% The integral of B_{2}(z) from x(1) to x(4) is
% The integral of Bk(z) from x(k-2) to x(k+2) is       (3<=k<=n-2)
% The integral of B_{n-1}(z) from x(n-3) to x(n) is
% The integral of B_{n}(z)   from x(n-2) to x(n) is
% The integral of B_{n+1}(z) from x(n-1) to x(n) is