Description of the illustration linear_rating

This figure shows data usage across 2 time periods and with two balances. Balance 1 has a total of 1 GB, with 10 MB remaining at 23:55:00. Balance 2 has a total of 500 MB. Usage spans from 23:55:00 to 00:00:05, with the charge changing at midnight. The total usage during the 10 minutes is 10 MB.