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45 Point Sizes; Line Spacing
51 One point is 1/72 inch,
52 so 6-point characters are at most 1/12 inch high,
53 and 36-point characters are \(12 inch.
54 There are 15 point sizes, listed below.
57 6 point: Pack my box with five dozen liquor jugs.
60 7 point: Pack my box with five dozen liquor jugs.
63 8 point: Pack my box with five dozen liquor jugs.
66 9 point: Pack my box with five dozen liquor jugs.
69 10 point: Pack my box with five dozen liquor
72 11 point: Pack my box with five dozen
75 12 point: Pack my box with five dozen
78 14 point: Pack my box with five
80 \s1616 point\s18 18 point\s20 20 point
82 \s2222\s24 24\s28 28\s36 36
91 it is rounded up to the next valid value,
96 reverts to the previous size, whatever it was.
98 begins with point size 10,
99 which is usually fine.
100 The original of this document (on 8.5 by 11 inch paper) is in 9 point.
102 The point size can also be changed in the middle of a line
104 with the in-line command
108 \s8UNIX\s10 runs on a \s8PDP-\s1011/45
112 \es8UNIX\es10 runs on a \es8PDP-\es1011/45
116 should be followed by a legal point size,
119 causes the size to revert to
123 can be understood correctly as `size 10, followed by an 11', if the size is legal,
125 Be cautious with similar constructions.
127 Relative size changes are also legal and useful:
131 temporarily decreases the size, whatever it is, by two points, then
133 Relative size changes have the advantage that the size difference
134 is independent of the starting size of the document.
135 The amount of the relative change is restricted
139 The other parameter that determines what the type looks like
140 is the spacing between lines,
141 which is set independently of the point size.
142 Vertical spacing is measured from the bottom of one line to
143 the bottom of the next.
144 The command to control vertical spacing is
146 For running text, it is usually best to set the vertical spacing
147 about 20% bigger than the character size.
148 For example, so far in this document, we have used
149 ``9 on 11'', that is,
161 the running text would look like this.
162 After a few lines, you will agree it looks a little cramped.
163 The right vertical spacing is partly a matter of taste, depending on how
164 much text you want to squeeze into a given space,
165 and partly a matter of traditional printing style.
172 Point size and vertical spacing make a substantial difference in the amount of text
180 Point size and vertical spacing make a substantial difference in the amount of text
183 10 on 12 uses about twice as much space as 7 on 8.
184 This is 6 on 7, which is even smaller.
185 It packs a lot more words per line,
186 but you can go blind trying to read it.
188 When used without arguments,
192 revert to the previous size and vertical spacing
198 is used to get extra vertical space.
200 it gives you one extra blank line (one
202 whatever that has been set to).
203 Typically, that's more or less than you want,
207 information about how much space you want _
211 means `two inches of vertical space'.
215 means `two points of vertical space';
220 means `two vertical spaces' _ two of whatever
223 (this can also be made explicit with
226 also understands decimal fractions in most places,
231 is a space of 1.5 inches.
232 These same scale factors can be used after
234 to define line spacing, and in fact after most commands
235 that deal with physical dimensions.
237 It should be noted that all size numbers are converted internally
238 to `machine units', which are 1/432 inch
240 For most purposes, this is enough resolution
241 that you don't have to worry about the accuracy of the representation.
242 The situation is not quite so good vertically,
243 where resolution is 1/144 inch