Pattern analysis aids
You can show or hide the pattern analysis aids by clicking the 'Pattern Analysis' button when showing a rectangular plot.
When the aids are shown the cursor changes to a cross-hair as you move the cursor over the plot area. While the cursor is over the plot two boxes are shown at the top right of the plot. These show the angle relative to the centre vertical line and, if plotting in dB, the dB down level from the 0dB line. If you are not plotting in dB then the second box shows the percentage of maximum field strength.
You can place two dashed lines on the plot by clicking either the left or right mouse buttons. The left button is for the top line, and the right button is for the bottom line. These lines can be dragged up and down. The levels of the lines are shown in the two boxes below the plot.