Calculated line-of-sight column-density maps of the CO₂ exosphere of Ganymede above the leading side from the EGM model (in units of 10¹⁸ m⁻²). Left: CO₂ release associated with H₂O sublimation with a CO₂/H₂O relative abundance of 5 for an H₂O areal ice fraction of 50% at latitudes > 50°N. Right: Sputtering of H₂O ice with CO₂/H₂O = 0.01 at latitudes > 40°N; the result was multiplied by 382 to match the observations (Appendices K, L). The green lines display the OCFBs. The subsolar point is at 2.6°N, 82°W.