Dialog Box - called from: Display Menu
You can specify the number of figures to the right of the decimal with the Decimals item. The labels will be stripped of trailing blanks and centered on the projection of the center of the bond (midpoint between atom centers), unless the Offsets are non-zero.
If the Background is opaque, each letter will lie on a small block of the designated color; this usually makes the labels easier to read. Some other programs may not be able to reproduce these opaque blocks in Metafiles or PICT files output. Labels are not supported for Pen Plot output.
Sequence. The labels may be plotted immediately after each atom, or all at once after all atoms have been plotted. The first usually looks better, but some labels will usually be partly or completely obscured. Some offset may be required.
Use PostScript font. This allows you to enter a character string for PostScript fonts supported by a PostScript printer if such fonts do not appear in the standard system font dialog called up by the Font button. This character string usually specifies the weight (normal, bold) and slant (italic, oblique) of the font, but not the size, which is specified in the Font dialog. Certain PostScript typefaces are standard, and should be present on most PostScript printers.
If the Scale box is checked, the letters in the labels in printed or file output will be rescaled to keep the same approximate proportions with respect to atoms, bonds, etc. as in the screen view.
Use the color options in this dialog, not the color options in the Font dialog, to set the color of the letters. Letters are always solid black in black-and-white display or output. See Input Colors/Patterns/Pens for general aspects of color input.
Individual bond labels may be "deleted", or marked for non-plotting, by clicking on the two atoms in succession and unchecking the Bond Label box in the Generated Atom Data dialog. The Show All button in this dialog will restore all bond labels to visibility, and the Delete All button will mark them all for non-plotting.
Labels on individual bonds can be moved onscreen with a special cursor mode controlled by the Move Labels button in the Dialog Bar - Right. The Zero Displacements button in this dialog will remove the displacements on all bond labels.
Note that in 3D Drawing mode the labels have an absolute position in space, including the x (front-back) coordinate. They are arbitrarily plotted 0.5 Angstroms in front of the center of the bonds, but they may still actually intersect or interpenetrate with the bond in some cases.