Datura family members with proper orbital elements determined by the AstDyS database projected onto two-dimensional planes of proper semimajor axis vs. proper sine of inclination (top), and proper semimajor axis vs. proper eccentricity (bottom). Formal one sigma uncertainties are shown by error bars. The large diamond symbol shows the largest family member (1270) Datura. The dashed ellipse shows orbits at 6 m s^-1 distance from (1270) Datura and ω + f = 30° and f = 40° at the moment of family formation (ω is argument of perihelion and f is the true anomaly). The gray interval of semimajor axis values approximately delimits the zone of the M9/16 mean motion resonance with Mars. Some Datura members, 433382, 89309 and 2009 VS116 from bottom to top, reside in this resonance. One asteroid, 452713, appears to jump over this resonance and resides on the extreme right of the plot. All these members have formally large distance δv_prop> 12 m s^-1 distance to (1270) Datura in the standard metric of the proper element space.