best_mix

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Use this when the diver asks what gas to breathe at a depth or which deco gases to carry: returns the richest bottom mix within a PPO₂ limit (default 1.4 bar) and an END limit (default 30 m, 98 ft), the nearest standard fill inside the same limits, and the standard deco gas ladder for that depth with switch depths. Not for checking one named gas (gas_specs) or planning the dive (plan_dive). The ladder is the common choice, not a prescription: none to 30 m, EANx50 to 45 m, EANx50 and oxygen to 60 m, and a travel gas deeper. A bottom mix under 18% O₂ needs descent_gas in plan_dive. No engine call. Example: {"depth":50}