Number of zones = 2 Zone 1 (Labels: x1 y1 z1) Species Abundance Mass Fraction ======= ============ ============= n 5.000000e-01 5.000000e-01 h1 5.000000e-01 5.000000e-01 Sum of mass fractions = 1.000000e+00 Zone 2 (Labels: x2 y2 z2) Species Abundance Mass Fraction ======= ============ ============= he4 2.500000e-01 1.000000e+00 Sum of mass fractions = 1.000000e+00 Remove zones: There are now 0 zones. Now add a zone: Number of zones = 1 Zone 1 (Labels: x3 y3 z3) Species Abundance Mass Fraction ======= ============ ============= c12 8.333333e-02 1.000000e+00 Sum of mass fractions = 1.000000e+00 Relabel the zone, update abundances, and print out the abundances again: Zone 1 (Labels: x4 y4 0) Species Abundance Mass Fraction ======= ============ ============= c12 4.166667e-02 5.000000e-01 o16 3.125000e-02 5.000000e-01 Sum of mass fractions = 1.000000e+00 Copy the zone, relabel the copied zone, and print out the abundances again: Zone 1 (Labels: x4 y4 0) Species Abundance Mass Fraction ======= ============ ============= c12 4.166667e-02 5.000000e-01 o16 3.125000e-02 5.000000e-01 Sum of mass fractions = 1.000000e+00 Zone 2 (Labels: x5 y5 0) Species Abundance Mass Fraction ======= ============ ============= c12 4.166667e-02 5.000000e-01 o16 3.125000e-02 5.000000e-01 Sum of mass fractions = 1.000000e+00