wheel/↑↓/W S slice · Ctrl+wheel zoom · right-drag or Space+drag pan · R reset
drag new box · click box to select, drag to move, drag corners to resize
1-9 0 - = class (changes selected box too) · [ ] set selected box first / last slice to current · Del delete · Esc deselect · Ctrl+Z undo
C next series/plane · N/P next/prev study · Shift+D done · Shift+S skip