FinalCut XML: question about the Center parameter

Hi, I'm writing a script that will massage some of the data in the XML file export from a sequence. I'm trying to understand the settings for the Center parameter in the Viewer.
If my Center point in the Viewer is 1 horizontal and 100 vertical, that corresponds to something like this in the XML:
<name>Center</name>
<keyframe>
    <when>147</when>
<value>
    <horiz>0.000347222</horiz>
    <vert>0.0520833</vert>
</value>
</keyframe>
Any idea how those horiz/vertical numbers correspond to the values 1 and 100?
thanks,
Scott

Hi Meg, actually looking at this again I'm still confused. In my new sequence which is 1620x1080, I have vertical keyframes 0, 16, 34, 60, 79, 104 and 212. In my XML, these correspond to:
0 : 0
16 : <vert>0.00833333</vert>
34 : <vert>0.0177083</vert>
60: <vert>0.03125</vert>
79: <vert>0.0411458</vert>
104: <vert>0.0541667</vert>
212: <vert>0.110417</vert>
However, if I divide each of the left-hand values above by 1080, I get different numbers:
16 / 1080 = .0148
34 / 1080 = .0314
60 / 1080 = .0555
79 / 1080 = .0731
104 / 1080 = .096
212 / 1080 = .196
So, I'm still not understanding where the <vert> numbers are coming from. Am I missing something? I understand the zero point is the center of the frame, so maybe that affects the calculations as well.
As you can probably tell I'm trying to calculate the position of the same clip in the larger 1620x1080 frame, so it matches the relative position in the 720x480 frame. (I've changed the Scale by multiplying it by 2.25, which is easy.)
I appreciate your help.
Scott

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