To maintain consistency in charts, which is crucial for readability, consider these tips:

• Establish a color scheme and stick to it across all elements, using colors to represent the same type of data consistently.
• Choose a clear, legible font, and use it throughout. For text and data labels, maintain a uniform font size and style.
• Apply a consistent style for all your data markers, lines, and bars. If you use a dashed line for projections in one chart, do the same in all others.
• Keep your axis labels and legends clear and consistently positioned. If you place the legend at the top of one chart, continue this throughout.