You want to be able to see the grid lines behind the square. Use the gray gridlines to graph your parabola, or draw your own horizontal and vertical lines inside the square.

Drawing and interpreting graphs and charts is a skill used in many subjects. Learn how to do this in science with BBC Bitesize. For students between the ages of 11 and 14.

How to Change Grid Line Colors on a Chart With Microsoft Excel. Grid lines add horizontal and/or vertical lines to your graph that aid in measuring graph values. By default, these grid lines use ...

Try drawing the line for global temperature relative to the pre-industrial average. Global mean temperature difference from 1850-1900 (five-year moving average, C) ...