Read from the drawn geometry, the first rung of the evidence ladder, in 570 ms. Window: symbols between 5 and 80 points across — the size range recorded for drawing E4 on this job, measured off this same drawing. Marks outside it are not looked at.
Names come from: no legend on this sheet, so NECA 100-2006 is what a name rests on. It is the baseline for what a symbol MEANS, never for matching shapes — proportions differ per firm. Confirming a name here is a correction, and corrections are what build the firm's file.
Lettering: glyph coverage 19% — 694 of 3,730 stroked glyphs matched to a letter (alphabet size 91).
Scale is 1/4" = 1'-0" — 18 points per foot. Read off the title block, so measurement off this sheet is available. A later correction flags any measurement taken under the old scale as stale rather than silently recomputing it.