Blade number | 6 | 7 |

6 | 18.8 | 14.4 |

7 | 25.7 | 41.0 |

Each row represents the number of blades in the first propeller and each column the number of blades in the second propeller for each of the four double-propeller templates. The entry for each template is the percent of the time that template has the lowest SMURF score (over the 478 proteins in which SMURF predicts a double-propeller with *p* value at most 0.01).