{
    "_meta": {
        "supplier": "Unknown (PIK/PRK family)",
        "type": "Disc",
        "model": "PRK300",
        "stdAir": { "temp_C": 20, "pressure_bar": 1.01325, "RH_pct": 0 },
        "coverageBasis": "bottom-coverage-pct",
        "coverageReference": [5, 10, 15, 20, 25],
        "dataQuality": "multi-coverage",
        "xAxisBasis": "per-element-Sm3h",
        "yAxisBasis": "ssotr-g-per-Nm3-per-m",
        "waterDepth_m": 4.0,
        "source": "'PIK & PRK300 data from QM.xlsx' (Sheet1). Same SOTE/SSOTR curves as the PIK300 sibling; the PRK300 differs only in DWP characteristics.",
        "note": "X-axis air flow uses 'Sm3' (US standard, 20 °C / 1013.25 mbar) rather than 'Nm3' (DIN, 0 °C). The existing diffuser specificClass internally normalises to 20 °C — so the values are usable as-is with that convention."
    },
    "sote_curve": {
        "5":  { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [27.87, 26.99, 25.80, 24.97, 24.38, 23.89, 23.46, 23.12] },
        "10": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [30.18, 29.33, 28.15, 27.33, 26.73, 26.21, 25.83, 25.49] },
        "15": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [31.51, 30.53, 29.16, 28.27, 27.57, 27.01, 26.55, 26.15] },
        "20": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [32.52, 31.39, 29.88, 28.84, 28.06, 27.45, 26.92, 26.49] },
        "25": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [33.26, 32.04, 30.39, 29.27, 28.45, 27.77, 27.22, 26.76] }
    },
    "otr_curve": {
        "5":  { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [19.509, 18.893, 18.060, 17.479, 17.066, 16.723, 16.422, 16.184] },
        "10": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [21.126, 20.531, 19.705, 19.131, 18.711, 18.347, 18.081, 17.843] },
        "15": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [22.057, 21.371, 20.412, 19.789, 19.299, 18.907, 18.585, 18.305] },
        "20": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [22.764, 21.973, 20.916, 20.188, 19.642, 19.215, 18.844, 18.543] },
        "25": { "x": [1.5, 2, 3, 4, 5, 6, 7, 8], "y": [23.282, 22.428, 21.273, 20.489, 19.915, 19.439, 19.054, 18.732] }
    },
    "p_curve": {
        "0": {
            "x": [1.5, 2,    3,    4,    5,    6,    7,    8],
            "y": [21.3, 24.0, 29.3, 35.3, 41.3, 46.8, 52.4, 58.6]
        }
    }
}