This video shows the weighting factors in action. You can see what percentage of each table is contributing. At idle its running soley off the Mapped Point 0 tables. So 100% of the spark is pulling from that table. The torque calculation values are being pulled from Mapped Point 0 as well.
As the RPM comes up, you can see that a combination of different tables are being used to determine the actual spark, torque, and speed density values.