What does the Dashed line means in the graphs?

[N0PainN0Gain]

I always wondered what those means in the CaddySpark Graph and in the HandStrength Graph as well.

[NoteCaddy Predator]

The dotted blue line indicates the average strength of the player pool for this same note. The orange line indicates the average strength of the individual player again.

Quoted from: CaddySpark - Assaultware Wiki