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Displaying Line Widths
You can display the widths of vector lines in a model by turning on Vector Line Widths from the Format menu. Simulink indicates the width of each signal at the block that originates the signal and the block that receives it. You can cause Simulink to use a thick line to display vector lines by selecting Wide Vector Lines from the Format menu. When you start a simulation or update the diagram and Simulink detects a mismatch of input and output ports, it displays an error message and shows line widths in the model.