The Depth Charts are playing time-weighted projections for each player which then build up to a team projection. The result of this team projection is in the upper-left corner of each team's depth chart. Here you'll find the team's projected record, runs scored, runs allowed, and triple-slash stats (AVG/OBP/SLG).
In both the position player and pitcher sections, boldfacing indicates a starting player at a position--someone who is getting at least 50% of the team's playing time at a single position for Position Players, or a projected rotation member or closer for Pitchers.
When reading the statistics, only PA and IP are broken out for each individual entry. All other batting and pitching statistics are rolled up for the entire year. For example, a bench player could have playing time at different positions - e.g. a fourth outfielder is slated to get 130 PA in LF and 170 PA in RF. For all other statistics besides PT% and PA, the numbers next to each entry in LF and RF will be his aggregate statistics for the 300 PA. This works similarly for pitchers who both start and relieve.
The "Order" column is the spot in the lineup where the position player is expected to hit.