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The data correspond to the input acoustic impedance of 180mm long pipes. These impedances are either measured or simulated by one of the authors. The associated Gitlab project provides scripts which can be used to process these data. Configurations studied The configurations studied are: -180mm long cylinders with a 14mm inner diameter and four end conditions: closed: infinite impedance or acoustic velocity=0 (measured and simulated) open unflanged: open with infinitely thin wall (only simulated) open with a 2mm circular flange: 2mm wall width (measured and simulated) open with a 7mm circular flange: 7mm wall width (measured and simulated) 180mm long conical pipes with an inner diameter varying from 10mm to 22.6mm (corresponding to a 2° half-angle) and three end conditions: closed: infinite impedance or acoustic velocity=0 (measured and simulated) open unflanged: open with infinitely thin wall (only simulated) open with a 2.7mm circular flange: 2.7mm wall width (only measured) The measurements were performed on batches of pipes built from different materials: brass (wall width 2mm) boxwood (wall width 7mm) 3D-printed ABS (wall width 7mm for cylinders and 2.7mm for conical pipes) Each batch consists of five pipes, and the first pipe was measured five times by each experimenter, resulting in nine impedance measurements per (configuration, material) combination. [!WARNING] Measured impedance data are scaled by the entrance characteristic impedance ρc/S. Simulated impedance data are not scaled by the entrance characteristic impedance. Files format The impedance files consist of three columns separated by space: frequency[Hz] Re(Z) Imag(Z) 1.010794e+02 3.457115e-02 3.639157e-01 ... [!WARNING] Measured impedance data are scaled by the entrance characteristic impedance ρc/S. Simulated impedance data are not scaled by the entrance characteristic impedance. Files organisation The data are stored in a .zip file containing 2 folders: `Measured_impedance` folder: contains measured data scaled by ρc/S. `Experimenter_OX`: one folder per experimenter(`O1`, `O2`, etc.). One subfolder per configuration (`3D_C` for closed 3D printed cylinders, `Brass_O` for brass open cylinders , etc.). One impedance file per measurement (either for different specimens: `..._2.txt`, `..._3.txt`; or repeated measurements on the same specimen: `..._1-1.txt`, `..._1-2.txt`). `Simulated_impedance` folder: contains simulated data not scaled by ρc/S. One folder per configuration (`Cylinder_closed`, `Cylinder_unflanged`, ...). One file per simulated impedance, named according to the following convention: `<Configuration>_<Operator-ID>_<Numerical-Method>_<Model>.txt`