41C sunrise/sunset program listing: what are these strange "dot" steps?

[Dave Britten]

I was looking at this sunrise/sunset program, and quite a few of the steps are just a mysterious dot character: •

https://www.hpmuseum.org/cgi-sys/cgiwrap...?read=1131

It doesn't look like a decimal point used elsewhere in the listing, but is that all it is? And if so, what's the significance of using a lone decimal point instead of 0?