Year - Year in which the season occurred

Ag - Age the player was on June 30th of that year.

Tm - Team they played for

Lg - League they played in

W - Wins

L - Losses

G - Games pitched in

GS - Games started

CG - Complete Games

SHO - Shutouts

SV - Saves

IP - Innings Pitched

H - Hits

ER - Earned Runs

HR - Home Runs

BB - Base on Balls (Walks)

SO - Strikeouts

ERA - Earned Run Average (9*ER/IP)

lgERA - Earned Run Average for a league average pitcher in that ballpark or combination of ballparks.

ERA+ - the ratio of the pitcher's ERA to that of the league. > 100 is above average and < 100 is below average. lgERA / ERA