[Orgmode] simple spreadsheet question - hlines affecting formulas

[Sullivan, Gregory \(US SSA\)]

The following spreadsheet behaves as expected, and every time I hit C-c* on the 
"Total" row, the formula recalculates to 0.4

| Name  | Percent |
| Foo   |      .1 |
| Bar   |      .3 |
| Total |     0.4 |
#+TBLFM: @4$2=vsum(@address@hidden)

The following spreadsheet is exactly the same, and has exactly the same formula 
for cell @4$2, except that I've added horizontal lines.  I thought horizontal 
lines are ignored during calculations, but now whenever I hit C-c* on the 
"Total" row, the vsum seems to include the value of @4$2, which I expected 
would be left out of the "@address@hidden" range.


|-------+---------|
| Name  | Percent |
|-------+---------|
| Foo   |      .1 |
|-------+---------|
| Bar   |      .3 |
|-------+---------|
| Total |     2.8 |
|-------+---------|
#+TBLFM: @4$2=vsum(@address@hidden)


Is this a bug?
Thanks.

--Greg
--
Gregory T. Sullivan, Ph.D.
BAE Systems Advanced Information Technologies
6 New England Executive Park, Burlington, MA 01803
781-262-4553 (office),  978-430-3461 (cell)
address@hidden