code/modules/power/supermatter/supermatter_gas.dm 
| /proc/sm_gas_data | Return a list info of the SM gases. Can only run after init_sm_gas |
|---|---|
| /datum/sm_gas | Contains effects of gases when absorbed by the sm. If the gas has no effects you do not need to add another sm_gas subtype, We already guard for nulls in /obj/machinery/power/supermatter_crystal/proc/calculate_gases |