anchor.diff:  #undef CONNECTED
   #undef EMPTY
   #undef LOW
  +#undef MEDIUM
   #undef FULL
   #undef DANGER
   
  
positive.code: #define CONNECTED 2
  #define EMPTY 4
  #define LOW 8
  #define FULL 16
  #define DANGER 32
  /obj/machinery/portable_atmospherics/canister/update_icon()
  	if(stat & BROKEN)
  		cut_overlays()
  
negative.code: 	var/pressure = air_contents.return_pressure()
  	if(pressure < 10)
  		update |= EMPTY
  	else if(pressure < 5 * ONE_ATMOSPHERE)
  		update |= LOW
  	else if(pressure < 10 * ONE_ATMOSPHERE)
  		update |= MEDIUM
  	else if(pressure < 40 * ONE_ATMOSPHERE)
  		update |= FULL
  	else
  		update |= DANGER
  