Structure | Description | Source | Figure |

Rod array | Nine rods equally spaced in a 27.3 cm by 47.0 cm rectangle. | Kientz and Barnes 2016 | 3(a) |

Extended rod array | Fifteen rods evenly spaced in a 43.2 cm by 54.6 cm rectangle. | Barnes, pers. comm. | 3(b) |

Single angle array | Four angles evenly spaced in a 40.6 cm by 32.4 cm rectangle. | Krebs et al. 2018 | 3(c) |

Double angle array | Two aluminum angle arrays (described previously). | Krebs et al. 2018 | 3(c), 5 |