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/usr/share/lensfun/6x6.xml is in liblensfun-data 0.2.8-3.

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The actual contents of the file can be viewed below.

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<lensdatabase>

    <mount>
        <name>rollei6x6</name>
        <compat>Generic</compat>
    </mount>

    <mount>
        <name>mamiya645</name>
        <compat>Generic</compat>
    </mount>

    <camera>
        <maker>Mamiya 645</maker>
        <model>All models</model>
        <mount>mamiya645</mount>
        <cropfactor>.577</cropfactor>
    </camera>

    <camera>
        <maker>Phase One</maker>
        <model>P 25</model>
        <mount>mamiya645</mount>
        <cropfactor>.577</cropfactor>
    </camera>

    <camera>
        <maker>Rolleiflex</maker>
        <model>2.8E</model>
        <mount>rollei6x6</mount>
        <cropfactor>.5</cropfactor>
    </camera>

    <lens>
        <maker>Schneider</maker>
        <model>Schneider 28mm Digitar f/2.8</model>
        <mount>mamiya645</mount>
        <cropfactor>.577</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="28" a="0.027509" b="-0.054383" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Mamiya</maker>
        <model>Mamiya 35mm f/3.5</model>
        <mount>mamiya645</mount>
        <cropfactor>.577</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="35" a="0.025471" b="-0.05106" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Mamiya</maker>
        <model>Mamiya 80mm f/2.8</model>
        <mount>mamiya645</mount>
        <cropfactor>.577</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="80" a="-0.008173" b="0.015478" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Mamiya</maker>
        <model>Mamiya 55-110mm f/4.5</model>
        <mount>mamiya645</mount>
        <cropfactor>.577</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="55" a="-0.001633" b="-0.002243" c="0" />
            <distortion model="ptlens" focal="65" a="-0.00477" b="0.008348" c="0" />
            <distortion model="ptlens" focal="75" a="0" b="0.002136" c="0" />
            <distortion model="ptlens" focal="83" a="-0.009877" b="0.021454" c="0" />
            <distortion model="ptlens" focal="90" a="-0.007302" b="0.019618" c="0" />
            <distortion model="ptlens" focal="100" a="-0.010183" b="0.025981" c="0" />
            <distortion model="ptlens" focal="110" a="-0.012796" b="0.029683" c="0" />
        </calibration>
    </lens>

    <lens>
        <maker>Schneider</maker>
        <model>Schneider 80mm Xenotar f/2.8</model>
        <mount>rollei6x6</mount>
        <cropfactor>.5</cropfactor>
        <calibration>
            <distortion model="ptlens" focal="80" a="0" b="-0.009721" c="0" />
        </calibration>
    </lens>

</lensdatabase>