Rotational distribution of the OH fragments following H₂O photodissociation by UV radiation fields of different shapes. The impact of three radiation fields is explored: (a) a radiation field representative of an accreting T Tauri star dominated by a Lyα emission line, (b) an ISRF radiation field and (c) a blackbody radiation field at 10 000 K. Vibrational quantum number are color coded as indicated in the top panel. The distribution is summed over the two electronic states. Only vibrational levels that contribute to at least 1.5% to the population of nascent OH are shown.