• Show Labels - when checked, isodose line are labeled.

As each isodose label is printed, the area it will occupy is tested for collision with a mathematical region which accumulates the printing area plus a small surrounding margin for all of the labels. If a label will overlap an existing label, its printing position is shifted along the isodose line until an unoccupied area is found. Note: the interactive labeling sliders are easier to access than these menu items.

• Default - Apply the preferences setting. If checked, the current setting equals the preference setting.
• Tightest - Sets the margin to 4 pixels. If checked, the current setting is < 6 pixels.
• Tight - Sets the margin to 8 pixels. If checked, the current setting is >= 6 and < 10 pixels.
• Medium - Sets the margin to 12 pixels. If checked, the current setting is >= 10 and < 14 pixels.
• Loose - Sets the margin to 16 pixels. If checked, the current setting is >= 14 and < 18 pixels.
• Loosest - Sets the margin to 20 pixels. If checked, the current setting is >= 18 pixels.

As each isodose curve is printed, potential labeling points are cached and sorted according to distance from the center of the diagram. When certain labels are printed, their preferred printing positions on the isodose curve are calculated as a fractional offset into that cache of points. A narrow setting tends to pull those labels towards the center of the diagram. Note: the interactive labeling sliders are easier to access than these menu items.

• Default - Apply the preferences setting. If checked, the current setting equals the preference setting.
• Narrowest - Sets the offset to 0.05. If checked, the current setting is < 0.10.
• Narrow - Sets the offset to 0.25. If checked, the current setting is between 0.1 and < 0.35.
• Medium - Sets the offset to 0.50. If checked, the current setting is between 0.35 and < 0.65.
• Wide - Sets the offset to 0.75. If checked, the current setting is >= 0.65 and < 0.90.
• Widest - Sets the offset to 0.95. If checked, the current setting is >= 0.90.

• Select a font to use for the isodose labels. The default font is 'Monaco'.

• Select the text style for isodose labels. The default is Bold.

• Select the text size for isodose labels. The default is 10 point. Use larger sizes when preparing screen captures for publication.

• Select the numeric format for isodose labels. The default is Auto. Use specific formats when preparing screen captures for publication.