Every time SAS sees a J= (justify) option in a title, the title goes to a new line. So, something like the following: title j=l "This is the first part" j=l "This is the second part"; will split the title across two lines.
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You can use an AXIS statement to override the limitation. For example:
goptions reset=all;
data test;
x='123456789012345678901234567890123456';
run;
proc gplot; plot x*x/vaxis=axis1;
axis1 value=('123456789012345678901234567890123456');
run;
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