One logarithmic mark left/right/top/bottom...

Four of the commands in the Margins menu of the Picture window.

## Purpose

To draw one mark into one of the four margins around the drawing area, along a logarithmic axis.

## Settings

Position
  the x (for top or bottom) or y (for left or right) position of the mark, expressed in the logarithmic domain or range of your latest drawing in the horizontal or vertical direction.
Write number
  if on, a real number equal to Position will be written in the margin, at an x (for top or bottom) or y (for left or right) position equal to Position.
Draw tick
  if on, a short line piece will be drawn in the margin, at an x (for top or bottom) or y (for left or right) position equal to Position.
Draw dotted line
  if on, a dotted line will be drawn through your drawing, at an x (for top or bottom) or y (for left or right) position equal to Position.
Draw text
  if not empty, this text will be drawn in the margin, at an x (for top or bottom) or y (for left or right) position equal to Position.

## Example

After you draw a Pitch logarithmically in a range between 100 and 400 Hz, choosing One logarithmic mark left... with a position of 200 and Draw dotted line on, will give you a horizontal mark "200" and a horizontal dotted line at a y position of 200, which is exactly halfway between 100 and 400 Hz.