style(style) specifies a "style" for the output
table. defaults:(style) is a synonym for
style(style). A "style" is a named combination of options
that is saved in an auxiliary file called estout_style.def.
estout is already equipped with four such files. The four styles
and their particulars are:

settings styles
tab fixed tex html

begin <tr><td>
delimiter _tab " " & </td><td>
end \\ </td></tr>
varwidth 0 12 12 12
modelwidth 0 12 12 12
abbrev off on off off

The tab style is the default. Use estoutdef to
view or edit defaults files. To make available an own set
of default options, edit one of the existing
files and save it as estout_newstyle.def
somewhere in the ado path. To call the new options set, type
estout ..., defaults(newstyle) .