This table is not used by the 6502 Second Processor version of Elite. Instead,
the CTWOS table in the I/O processor code is used, which contains single-pixel
character row bytes for the mode 2 dashboard.
There is one extra row to support the use of CTWOS+1,X indexing in the CPIX2
routine. The extra row is a repeat of the first row, and saves us from having
to work out whether CTWOS+1+X needs to be wrapped around when drawing a
two-pixel dash that crosses from one character block into another. See CPIX2
for more details.