Four-color scatter plot color schemes

Quick answer：

Four-color scatter plot color schemes refer to color palettes that utilize four distinct colors to represent different data points or categories in a scatter plot. These schemes are commonly used in data visualization to enhance the clarity and readability of the data. Some popular four-color schemes include: 1) Rainbow color scheme, which uses a gradient of colors from red to blue; 2) Dark palette, which uses darker shades of colors; 3) Sequential palette, which uses colors that gradually change in intensity; and 4) Diverging palette, which uses two sets of colors that diverge from a central point. Each scheme has its own advantages and is suitable for different types of data and visualization purposes.