The microtype package

IMPLEMENTATION: Package options 1213920 {\MT@optwarn@nan{##1}{#1}}%3921 }%3922 }3923 }\relax3924 factor will define the protrusion factor only.3925 3926 \define@key{MT}{factor}[\MT@factor@default]{%3927 \def\@tempa{#1 }%3928 \MT@ifint\@tempa3929 {\edef\MT@pr@factor{\@tempa}}3930 {\MT@optwarn@nan{#1}{factor}}%3931 }Unit for protrusion codes.3932 \define@key{MT}{unit}[character]{%3933 \def\@tempa{#1}%3934 \MT@ifstreq\@tempa{character}\relax{%3935 \MT@ifdimen\@tempa3936 {\let\MT@pr@unit\@tempa}%3937 {\MT@warning@nl{`\@tempa’ is not a dimension.\MessageBreak3938 Ignoring it and setting values relative to\MessageBreak3939 character widths}}%3940 }%3941 }\MT@endinput14.4.2 Loading the definition fileAbort if no capable engine found.3942 \let\MT@endinput\relax3943 \ifx\MT@engine\relax3944 \MT@warning@nl{You don’t seem to be using either pdftex, luatex, or xetex.\MessageBreak3945 `\MT@MT’ only works with these engines.\MessageBreak3946 I will quit now.}3947 \MT@clear@options3948 \else3949 \input{microtype-\MT@engine tex.def}3950 \fi3951 \MT@endinput14.4.3 Reading the configuration fileThe package should just work if called without any options. Therefore, expansionwill be switched off by default if output is DVI, since it isn’t likely that expandedfonts are available. (This grows more important as modern TEX systems haveswitched to the pdfTEX engine even for DVI output, so that the user might not evenbe aware of the fact that she’s running pdfTEX.)3952 \MT@protrusiontrue3953 3954 3955 \ifnum\pdfoutput