Orbital and latitudinally averaged total injection rates of ablated Na (Figure A4(a)) and Fe (Figure A4(b)) for different relative mass contributions of the HTCs and the OCCs: 26.7% HTC and 73.3% OCC (in blue); 50% HTC and 50% OCC (in orange); 75% HTC and 25% OCC (in black); and 86.1% HTC and 13.9% OCC (in red). The panels also show the fraction of Na and Fe ablated above 125 km altitude for different relative contributions of HTCs and OCCs.