The horizontal axis shows the rating difference.
The vertical axis shows points change.

The colored lines from yellow to blue are rating points for game results colored per rating grade.
The thick blue lines are rating points for game results in a standard Elo system using a K factor of 24.
The upper half are wins and the lower half are losses.
The general shape of the lines is determined by the expected winning probabilities, determined by the a function.
The vertical scale of the lines is determined by the con factor. It means that for higher ratings, less points are at stake in a game.
The lines for the lower ratings are shifted upward by the bonus term. It affects lower ratings more than higher ratings.