Camera Raw Default Tone Curve Function / Coordinates

Hi,
I would like to know where I can find the function / coordinates for the Lightroom / ACR default tone curve that is applied to any image.
I think it's the red one in that image, or it's very very close:
I want to generate a lookup table to match it's effect. For now I plotted something that is very very close but I lack precision at the bottom of my curve.
Cheers,
Thomas

I'm confused - I thought the default was linear. I mean, this is probably not what you want, but here is a curve which makes PV2012's linear tone curve equivalent to PV2010 linear, or at least that's how I call it:
<dngclr:ToneCurve rdf:parseType="Resource">
<dngclr:Edit0 rdf:parseType="Resource">
 <dngclr:X>0</dngclr:X>
 <dngclr:Y>0</dngclr:Y>
</dngclr:Edit0>
<dngclr:Edit1 rdf:parseType="Resource">
 <dngclr:X>17</dngclr:X>
 <dngclr:Y>26</dngclr:Y>
</dngclr:Edit1>
<dngclr:Edit2 rdf:parseType="Resource">
 <dngclr:X>34</dngclr:X>
 <dngclr:Y>44</dngclr:Y>
</dngclr:Edit2>
<dngclr:Edit3 rdf:parseType="Resource">
 <dngclr:X>51</dngclr:X>
 <dngclr:Y>60</dngclr:Y>
</dngclr:Edit3>
<dngclr:Edit4 rdf:parseType="Resource">
 <dngclr:X>68</dngclr:X>
 <dngclr:Y>74</dngclr:Y>
</dngclr:Edit4>
<dngclr:Edit5 rdf:parseType="Resource">
 <dngclr:X>85</dngclr:X>
 <dngclr:Y>89</dngclr:Y>
</dngclr:Edit5>
<dngclr:Edit6 rdf:parseType="Resource">
 <dngclr:X>102</dngclr:X>
 <dngclr:Y>105</dngclr:Y>
</dngclr:Edit6>
<dngclr:Edit7 rdf:parseType="Resource">
 <dngclr:X>119</dngclr:X>
 <dngclr:Y>120</dngclr:Y>
</dngclr:Edit7>
<dngclr:Edit8 rdf:parseType="Resource">
 <dngclr:X>136</dngclr:X>
 <dngclr:Y>135</dngclr:Y>
</dngclr:Edit8>
<dngclr:Edit9 rdf:parseType="Resource">
 <dngclr:X>153</dngclr:X>
 <dngclr:Y>151</dngclr:Y>
</dngclr:Edit9>
<dngclr:Edit10 rdf:parseType="Resource">
 <dngclr:X>170</dngclr:X>
 <dngclr:Y>167</dngclr:Y>
</dngclr:Edit10>
<dngclr:Edit11 rdf:parseType="Resource">
 <dngclr:X>187</dngclr:X>
 <dngclr:Y>183</dngclr:Y>
</dngclr:Edit11>
<dngclr:Edit12 rdf:parseType="Resource">
 <dngclr:X>204</dngclr:X>
 <dngclr:Y>200</dngclr:Y>
</dngclr:Edit12>
<dngclr:Edit13 rdf:parseType="Resource">
 <dngclr:X>221</dngclr:X>
 <dngclr:Y>218</dngclr:Y>
</dngclr:Edit13>
<dngclr:Edit14 rdf:parseType="Resource">
 <dngclr:X>238</dngclr:X>
 <dngclr:Y>236</dngclr:Y>
</dngclr:Edit14>
<dngclr:Edit15 rdf:parseType="Resource">
 <dngclr:X>255</dngclr:X>
 <dngclr:Y>255</dngclr:Y>
</dngclr:Edit15>
</dngclr:ToneCurve>

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BOILERPLATE TEXT:
If you give complete and detailed information about your setup and the issue at hand, such as your platform (Mac or Win), exact versions of your OS, of Photoshop and of Bridge, machine specs, what troubleshooting steps you have taken so far, what error message(s) you receive, if having issues opening raw files also the exact camera make and model that generated them, etc., someone may be able to help you.
Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
http://forums.adobe.com/thread/419981?tstart=0
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<img alt="Picture hosted by Pixentral" src="http://www.pixentral.com/hosted/1aSxBBhQ7Bp0qxCLcJGx5Vtic84SWX_thumb.jpg" border="0" /> ___and___
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