original: the rotation period could not be estimated conclusively -lrb- best fit ~ 4 h -rrb- .
simplifications: the rotation period could not be estimated conclusively -lrb- best fit ~ 4h -rrb- . the rotation period could not be judged well -lrb- best fit ~ 4 h -rrb- . the rotation period could not be estimated perfectly -lrb- best fit ~ 4 h -rrb- . the rotation period was roughly estimated to be around 4 hours . a best guess might be around four hours , however , the rotation period could not be definitely arrived at . the rotation time could not be estimated accurately -lrb- best fit ~ 4 h -rrb- . the best estimate for a rotation period is 4 hours . he rotation period could n't be estimated conclusively .