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# Table 1 Film thickness *h* (standard deviation \(\delta h\)) calculated by fitting \(R_{\mathrm{a}}(t)\) (\(\phi = 0.4\) suspension) to inviscid and viscous models. HF : high-frequency wave; H : Helmholtz resonance; AF : air flow; *N*: number of runs used; *r* : correlation coefficient (standard deviation \(\delta r\)); \(\Delta t\) : Time span used for the fit. In terms of *N*, the inviscid model gives a higher *r* for 69 % of the runs

Case |
N
| Inviscid \(h (\delta h) (\mu\)m) | Viscous \(h (\delta h)(\mu\)m) |
---|---|---|---|

3 (HF) | 35 | 5 (4) | 26 (21) |

5 (H) | 16 | 69 (93) | 44 (36) |

6a (AF\(+\)H) | 4 | 65 (60) | 36 (25) |

6b (AF) | 3 | 4 (4) | 22 (12) |

Total, r (\(\delta r\))
| 58 | 0.984 (0.002) | 0.969 (0.003) |

Total, \(\Delta t\) (ms) | 58 | \(2.4 \pm 2.4\) | \(1.2 \pm 1.0\) |