I agree with "line".
Two possibilities occur to me. At least one is a red herring.
HMS Raleigh shows that she is sailing on a course of 016o. If the other ships of the squadron are "dead abeam" to starboard they would be at an angle of 90o to HMS Raleigh. 90 + 16 = 106, so a line drawn across their bows would be at 106o (from North). Two days before the course was 012o and HMS Constance "proceeded to take station 6 miles 102o from Flag." That's 90 + the course, again. (The next day the course was 008o and took station 98o.)
They are in a line (in the first instance)16o on the starboard quarter (16o behind abeam) and in the second instance - 12o.
The former is a very tempting conclusion, but I don't actually know.