st: toeplitz

[David Airey <david.airey@Vanderbilt.Edu>]

Can Stata estimate a model assuming the toeplitz variance-covariance 
structure (type=TOEP(1) in SAS Proc Mixed):

s^2   s1   s2   s3
s1    s^2  s1   s2
s2    s1   s^2  s1
s3    s2   s1   s^2

I have a data coming from a 13x13 matrix of "treatment conditions" 
where the row and column levels are the same, e.g.,

 1 2 3 4 5
1
2
3
4
5

In SAS, we might use the following model and code:

u + Alpha_1(i) + Alpha_2(i) + M_{i}+ e_m(i) where
 u     = grand mean
 Alpha = polygenic effects           random (13 of them)
 M     = QTL effect                  fixed
 e_m   = random error

proc mixed data=a;
   model trait = m1;
   random alpha1-alpha13/type=TOEP(1);

What in Stata might come close to this model in terms of the command 
and covariance?

Thanks for any tips.

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