A description of a set of atoms. See Atom Selection, for the
complete syntax.
char
A character
del
The delimiter - a single character which is used to mark
the end of a portion of a command. Initially, it is a
dollar sign but can be changed using the DELIM command,
see Delim Command. It should be noted that the
delimiter cannot be a character within any string it is
supposed to delimit.
deldel
Two delimiters concatenated together with no space in between.
integer
An integer.
iupac
IUPAC name for an atom. Initially specified in the
residue topology file.
keyword
A word, see below, serving to identify some option.
equivalent to real real integer. The first real is the
minimum value in the range, the second number is the
maximum value in the range, and the third number gives
the number of interval, i.e. lines or columns.
real
A real number. No decimal point is required for the
number to be interpreted correctly.
resid
Residue identifier (a string of up to 4 characters).
resname
Residue name.
segid
Segment identifier (a string of up to 4 characters).
string
An ordered set of characters.
tag
A string which is a tag, i.e. no embedded spaces.
title
A series of 1 to 10 lines of text (max 80 characters per line)
terminated by a line which has an asterisk `*' as the first
character. Used for commenting files.