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However, if there are two or 0133 more <code>\addvspace</code>’s in a sequence then together they only add the 0134 space needed to make the natural length equal to the maximum of the 0135 <var>vert-length</var>’s in that sequence. This command is fragile 0136 (see <a href="_005cprotect.html#g_t_005cprotect">\protect</a>). The <var>vert-length</var> is a rubber length 0137 (see <a href="Lengths.html#Lengths">Lengths</a>). 0138 </p> 0139 <p>This example illustrates. The <code>picture</code> draws a scale. In a 0140 standard LaTeX article the length <code>\baselineskip</code> is 12pt. 0141 The two rules here are 22pt apart: the sum of the 0142 <code>\baselineskip</code> and the 10pt from the first <code>addvspace</code>. 0143 </p> 0144 <div class="example"> 0145 <pre class="example">\documentclass{article} 0146 \usepackage{color} 0147 \begin{document} 0148 \setlength{\unitlength}{2pt}% 0149 \noindent\begin{picture}(0,0)% 0150 \multiput(0,0)(0,-1){25}{{\color{blue}\line(1,0){1}}} 0151 \multiput(0,0)(0,-5){6}{{\color{red}\line(1,0){2}}} 0152 \end{picture}% 0153 \rule{0.25\linewidth}{0.1pt}% 0154 \par\addvspace{10pt}% \addvspace{20pt}% 0155 \par\noindent\rule{0.25\linewidth}{0.1pt}% 0156 \end{document} 0157 </pre></div> 0158 0159 <p>Now uncomment the second <code>\addvspace</code>. It does not make the gap 0160 20pt longer; instead the gap is the sum of <code>\baselineskip</code> 0161 and 20pt. So <code>\addvspace</code> in a sense does the opposite of 0162 its name — it makes sure that multiple vertical spaces do not 0163 accumulate, but instead that only the largest one is used. 0164 </p> 0165 <p>LaTeX uses this command to adjust the vertical space above or below 0166 an environment that starts a new paragraph. For instance, a 0167 <code>theorem</code> environment begins and ends with <code>\addvspace</code> so 0168 that two consecutive <code>theorem</code>’s are separated by one vertical 0169 space, not two. 0170 </p> 0171 <p>A error ‘<samp>Something's wrong--perhaps a missing \item</samp>’ pointing to an 0172 <code>\addvspace</code> means that you were not in vertical mode when you hit 0173 this command. One way to change that is to precede <code>\addvspace</code> 0174 with a <code>\par</code> command (see <a href="_005cpar.html#g_t_005cpar">\par</a>), as in the above example. 0175 </p> 0176 0177 0178 0179 <hr/><div class='referenceinfo'> <a href='https://latexref.xyz/'> <i>Unofficial LaTeX2e reference manual</i></a></div> 0180 </body> 0181 </html>