help understanding sprite sheet example

[modern oar]

So i'm going through the sprite sheet example on bevy's website and i'm having a hard time understanding it. Specifically, when you're defining the texture_atlas.
let texture_atlas = TextureAtlas::from-grid(texture_handle, Vec2::new(24.0, 24.0), 7, 1);

So i understand how the Vec2 specifies the dimensions of the sample you want from the sprite sheet, but what are those extra arguments 7 and 1 do?
the link to the example: https://bevyengine.org/examples/2d/sprite-sheet/

[flat glacier]

https://docs.rs/bevy/0.8.1/bevy/sprite/struct.TextureAtlas.html#method.from_grid