是一个关于输出多个表格的变量顺序问题，代码如下：

#delimit
reg group_size rank__with_phd_degree_  cite_first2 atleastoneasia
atleastoneamerica atleastoneeuro atleastoneoceania others publication_year;
/*save the regression results;*/
est store A1;

/* using first five years citation;*/
reg group_size rank__with_phd_degree_  cite_first5 atleastoneasia
atleastoneamerica atleastoneeuro atleastoneoceania others publication_year;

/*save the regression results;*/
est store A2 ;

/*output*/

outreg2 [A1 A2] using text52.rtf, noaster bracket;

两个regressions的唯一差别在于cite_first2和cite_first5,但是默认的outreg2里面variable，第二个表中cite_first5总是在最后一行。
如何自己设定variables的order，让cite_first2和cite_first5紧连着？

谢谢了！