Enter the 1st redshift: 1.0
Enter the 2nd redshift: 2.0
Enter the Hubble constant: 71.0
Enter the Omega_matter: 0.27

Angular diameter distance DA(0,z1) = 1658.7 Mpc
Angular diameter distance DA(0,z2) = 1748.4 Mpc
Angular diameter distance DA(z1,z2) = 642.6 Mpc