st: Aligning columns when appending regression tables using estout

[Miranda Kim <mk@mrc.soton.ac.uk>]

Hello,
Any suggestions with the following would be of great help...
I am wanting to amend the following code, such that my regression models 
involving the same outcome are aligned in the same column, so in the 
example below weight and length would feature in the same column, and 
the second row would have three blank cells at the start...

sysuse auto, clear

est clear
foreach y of varlist mpg weight length {
   eststo `y': regress `y' displacement
}
esttab using test.csv, replace cells(`"b(fmt(a1) star) ci(fmt(2) par("(" 
"," ")")) p(fmt(3))"') ///
stats(N, fmt(2 0)) plain drop(_cons) label noobs nonum  collabels(none)

est clear
foreach y of varlist weight length {
   eststo `y': regress `y' gear_ratio
}
esttab using test.csv, append cells(`"b(fmt(a1) star) ci(fmt(2) par("(" 
"," ")")) p(fmt(3))"') ///
stats(N, fmt(2 0)) plain drop(_cons) label noobs nonum  collabels(none)

Many thanks,
Miranda

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