what does the distance between two white horizontal lines on this graph represent?

The distance between the two white horizontal lines represents a fixed increase in the value shown on the vertical (y) axis of the graph, such as a specific amount of brain volume, height, or other measured quantity.

What the distance usually means

On most scientific or data graphs, each horizontal grid line corresponds to a specific y‑axis value, and the equal spacing between lines reflects equal numerical steps.

If, for example, the y‑axis is labeled “Mean brain volume (cm³)” with values 300, 500, 700, 900, etc., then the distance between two adjacent white horizontal lines represents an increase of 200 cm³ in brain volume.

How to read it on your graph

To know exactly what it represents on your graph:

• Check the numbers written next to the y‑axis at each horizontal line.

• Subtract the lower value from the higher value between two adjacent lines; that difference (like 200 cm³ in the brain‑volume example) is what the vertical distance between the two white lines stands for.

Why this matters

That vertical spacing tells you how much the measured quantity changes when a point moves from one white line up to the next.

It lets you visually estimate differences or changes in the data without calculating every value precisely, which is why equal spacing and clear labeling on the y‑axis are so important.

Information gathered from public forums or data available on the internet and portrayed here.