I'm looking at a pice of music that shows an arpeggio between two dotted half-notes in one voice and a quarter-note in the other voice. Specifically, in the wee snippet below, the first e4 in the first voice is at the top of the arpeggio above the <gs~ b>2 in the second voice.
%%%%%%%%%%%%%%%%%%
<<
{
e4 e4 b4 | % 1
e2 b8[ b8] | % 2
}
\\
{
<gs~ b>2.\arpeggio | % 1
\stemUp gs2 \stemNeutral s4 | % 2
}
>>
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