Prints comparison of measurements and their estimations.

def output_solution(self, fd, z, z_est, error_sqrsum):
        """ Prints comparison of measurements and their estimations.
        """
        col_width = 11
        sep = ("=" * col_width + " ") * 4 + "\n"

        fd.write("State Estimation\n")
        fd.write("-" * 16 + "\n")
        fd.write(sep)
        fd.write("Type".center(col_width) + " ")
        fd.write("Name".center(col_width) + " ")
        fd.write("Measurement".center(col_width) + " ")
        fd.write("Estimation".center(col_width) + " ")
        fd.write("\n")
        fd.write(sep)

        c = 0
        for t in [PF, PT, QF, QT, PG, QG, VM, VA]:
            for meas in self.measurements:
                if meas.type == t:
                    n = meas.b_or_l.name[:col_width].ljust(col_width)
                    fd.write(t.ljust(col_width) + " ")
                    fd.write(n + " ")
                    fd.write("%11.5f " % z[c])
                    fd.write("%11.5f\n" % z_est[c])
#                    fd.write("%s\t%s\t%.3f\t%.3f\n" % (t, n, z[c], z_est[c]))
                    c += 1

        fd.write("\nWeighted sum of error squares = %.4f\n" % error_sqrsum)