There is no separation, the shading is based on the highest volume in the order book irrespective of which side it is on.
A user in the SC forum has also pointed out that the chart is not time based i.e. if there is no trade it would not get updated. I thought all have to be aware of this and here is my response:
The above indicator updates only when a tick is traded and is not based on time. During market hours in the instrument I trade it is highly unlikely that no trade is executed for any significant length of time (few ms). The example chart included is a 10t chart not a timed chart. In fact when I set it as a 1t chart it was too fast for me.
In Sierra I cannot visually see the DOM has changed, only after a trade has occurred. In my example I dont know if that line where the arrow points to is still white or grey or black until a trade occurs.
As per my message in the forum to change the width please go to the indicator setting and change the width (just above setting colour). It would change width of all lines.
As far as I know whenever there is a DOM change SC would update the indicator. However the indicator would not move horizontally until a trade takes place. So the first dash on the right is the current DOM value however, the indicator would not scroll based on new DOM data coming in but based on trade executing.
The above is how indicators are designed in SC (I believe) as the underlying structure is base on tick data and everything is tied to that. The best you can do is to set your chart as a 1t chart and as the data would be frequent the indicator would also moves frequently.
My question is, assuming you set it at 1 tick or 1 second or whatever; are you able to display the live DOM on the chart. You can see the DOM changing without trades happening, is it possible to display that. That is where the true power lies.