Use the image to determine the answer to the following question: What does the image show?

Description of the Image

The image shows a close-up of a grid paper with handwritten numbers and lines.

• There is a grid pattern visible on the left side, with blue lines forming squares.
• On the right side, there are two numbers written in dark gray: '90' and '100'.
• A horizontal line segment is visible to the right of each number, possibly indicating a scale or a measurement mark.
• A vertical, light blue-green shaded area is partially visible between the grid and the numbers.

The image displays a portion of a graph or a measurement scale, showing the numbers 90 and 100.