Axis 282 Bedienungsanleitung PDF herunterladen (Seite 38)

Chapter II-12 — Graphs

II-270

Tick Dimensions

You can control the length and thickness of each type of tick mark that Igor makes and the location of tick

marks relative to the axis line using items in the Tick Dimensions area. Igor distinguishes four types of tick

marks: major, minor, “fifth”, and subminor:

The tick mark thicknesses normally follow the axis thickness. You can override the thickness of individual

tick types by replacing the word “Auto” with your desired thickness specified in fractional points. A value

of zero is equivalent to “Auto”.

The tick length is normally calculated based on the font and font size that will be used to label the tick

marks. You can enter your own values in fractional points. For example you might enter a value of 6 for the

major tick mark, 3 for the minor tick mark and 4.5 for the 5th or emphasized minor tick marks. The submi-

nor tick mark only applies to log axes.

Use the Location pop-up menu to specify that tick marks for the selected axis be outside the axis, crossing

the axis or inside the axis or you can specify no tick marks for the axis at all.

Grid

Grid lines can be added to the graph using the Grid pop-up menu. choose Off if you do not want a grid, On

if you want grid lines on major and minor tick marks or Major Only if you want grid lines on major tick

marks only.

The default appearance of the major, minor, and subminor grid lines varies. Normally the default grids are

sufficient, however Igor provides the ability to customize their appearance:

Igor provides five grid styles identified with numbers 1 through 5. Different grid styles have major and

minor grid lines that are light, heavy, dotted or solid. If the style is set to zero (the default) and the graph

background is white then grid style 2 is used. If the graph background is not white then grid style 5 is used.

Use the Grid Color palette to set the color of the grid lines. They are by default light blue.

The grid line thickness is set to a fraction of the axis line thickness. Since the axis line thickness is usually

one point, and computer monitors usually have a resolution of about a point, it generally is not possible to

see the differences in thickness on your screen. To see the difference, print the graph — printer resolution

is usually higher than screen resolution.

Sometimes the dotted lines in the grid disappear on color printers. This is because the colors are “dithered”,

that is, color shades are composed by printing several dots of varying colors, which are mixed in the eye.

0.1

2 3 4 5 6 7 8 9

1.00.80.60.40.20.0

Fifth or Emphasized

Major Minor

Subminor

Normal Axis Log Axis

Major

Minor

Grid line thickness is a fraction of the

axis line thickness (see Axis Tab on

page II-266).

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