Panels a and e: distributions of the original orbital energy z = 1∕a (see text for details). The remaining panels give quantity for four different range of semi-major axes (see text for details). Panels b and f: median of cos i_E (black line) and first and third quartiles (boundary of gray area). Panels c and g: proportion of retrograde orbits (black line: all comets, red line: jumpers, blue line: creepers, orange line: KQ-jumpers, magenta line: KQ-creepers). Panels d and h: proportions of comets in each observable class is given (same color code as for the third row). Panels a–d: D0 proto-Oort cloud. Panels e and f: I0 proto-Oort cloud.