Red Range Numbers are Session Support and Resistance respectively.

The Green Range Number is The Opening Tick According to Top Gun Trading Systems, Inc. (This will often not coincide with "the Open" as tagged by other data feed companies)

All Maroon Range Numbers are alternate support and resistance levels.

Essentially the further away from the trading action the Range Number is, the more difficult it should be for that range number to be broken.

As such each Range Number as it is approached will typically provide an area where price action should Stop, Stall or Stutter.

Clustered numbers of the same or near the same value typically represent a Very Hard area of support or resistance and are typically not easy to break through.

When and IF price does breakout of clustered areas, it typically does it with a large degree of magnitude.

Once price has been through a Range Number, it will often provide some degree of support or resistance. Should price retrace back through the Range Number traders can expect a similar Stop, Stall or Stutter from the new direction.

Trading strategies can be applied to each level as price move through the column of Numbers during each session.

Very often Range Numbers will coincide with other areas indicated by technical analysis. When this occurs the significance of the Range Number often provides significant support or resistance levels.