It really makes a big difference in the way that it's played depending on the way that both clefs are arpeggiated in your version. (For some reason the picture won't show up, so I'm assuming that there is that squiggly line indicating an arpeggiation). If it is a continuous wavy line spanning both the bass and trebble clef, then the lowest note is always played first, followed by the next lowest, and so on. If the wavy lines arpeggiating the bass and trebble clefs are separate then the notes in the bass and trebble clef are arpeggiated simultaneously.