[Groff] Multi-column format with ms macros

[Kurt Kehler]

I am trying to format three columns per page using the ms macros.
However, the first item on the first page in the first column
gets printed lower than the first items in columns two and three,
yet page 2 has the tops of all the columns at the same vertical
position.  I'm using groff 1.20.1.

I have attached the source file and the postscipt output of:
groff -ms source >source.ps

I must be overlooking something but I can't find it.

Thanks,
Kurt Kehler

source.ps
Description: PostScript document

source
Description: Text document