However, although the total is 628 (twice 314) there are only 302 glyphs on side b. On side a there are 326 glyphs. Somewhere I must have made a mistake in thinking there were an equal number of glyphs on the sides. I now will retrace my steps to see what happened. Possibly I first noticed 628 when I constructed a preliminary table for the structure of the E text:

Partition	Subject	Distinctions	Number of glyphs
1	Introduction to moon calendar (?)	Glyphs similar to those in the moon calendar	7
2	Moon calendar (?)	*9 sequences of similar glyphs starting with a standing person holding toki* and ending with three characteristic glyph types**	99
3	?	20 - 9 = 11 glyph sequences with various glyphs ending with the last two of the three characteristic glyph types	208 (?)
4	Introduction to calendar for the year (?)	Various glyphs	48
5	Calendar for the year (?)	24 glyph sequences ending with a characteristic glyph type	167
6	?	Various glyphs	99
Total number of glyphs			628

99 glyphs were specified like this:

Period no.	Number of glyphs
1	8
2	8
3	9
4	12
5	11
6	10
7	11
8	18
9	12
Total number of glyphs	99

So far so good. It can be argued that the total number should be 106 (by including the first 7 glyphs in the text), but that is no great question.

99 probably is correct, cfr for instance the 99 glyphs from the 2nd Rei (Ka3-15) up to and including viri at Kb4-7. Also, 99 is a number connecting to the cycle of Venus:

"After five complete cycles totaling 2,920 days, the movement of Venus fill eight idealized years of 365 days each and come within hours of spanning 99 lunations." (Popol Vuh)

2,920 / 99 = 29.49 and a synodic month is 29.53 days.