Lines spaced a minor third apart provide a slightly less dense
appearance than lines spaced a whole step apart. Between the lines are
two space-notes at different elevations. There is a repeated
line-space-space pattern, three basic note positions that occur four
times per octave. (Rather than a 6-6 or 7-5 pitch pattern, this could be
called a 4-4-4 pitch pattern.) Three standard lines alternate with a
ledger or bold line which allows for identification of the lines when
stacking staves contiguously for greater pitch range.