<?xml version="1.0" encoding="utf-8"?>
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">
    <loc xlink:type="locator" xlink:href="../../pte/2005-02-28/usfr-pte-2005-02-28.xsd#usfr-pte_ChangeCurrentAssetsAbstract" xlink:label="usfr-pte_ChangeCurrentAssetsAbstract" />
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="usfr-pte_ChangeCurrentAssetsAbstract" xlink:to="usfr-pte_ChangeCurrentAssetsAbstract_lbl_1" priority="1" />
    <label id="label_ChangeCurrentAssetsAbstract_1108363571286_0" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="usfr-pte_ChangeCurrentAssetsAbstract_lbl_1" xml:lang="en" xlink:title="label_ChangeCurrentAssetsAbstract">Increase/(Decrease) in Operating Assets</label>
    <label id="label_ChangeCurrentAssetsAbstract_1108363547782_1" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="usfr-pte_ChangeCurrentAssetsAbstract_lbl_1" xml:lang="en" xlink:title="label_ChangeCurrentAssetsAbstract">Operating Assets</label>
    <loc xlink:type="locator" xlink:href="../../pte/2005-02-28/usfr-pte-2005-02-28.xsd#usfr-pte_ChangeCurrentAssets" xlink:label="usfr-pte_ChangeCurrentAssets" />
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="usfr-pte_ChangeCurrentAssets" xlink:to="usfr-pte_ChangeCurrentAssets_lbl_1" priority="1" />
    <label id="label_ChangeCurrentAssets_1108363604553_1" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="usfr-pte_ChangeCurrentAssets_lbl_1" xml:lang="en" xlink:title="label_ChangeCurrentAssets">Increase/(Decrease) in Operating Assets</label>
    <label id="label_ChangeCurrentAssets_1108363639574_0" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="usfr-pte_ChangeCurrentAssets_lbl_1" xml:lang="en" xlink:title="label_ChangeCurrentAssets">Operating Assets</label>
    <label id="label_ChangeCurrentAssets_1108363621968_0" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="usfr-pte_ChangeCurrentAssets_lbl_1" xml:lang="en" xlink:title="label_ChangeCurrentAssets">Increase/(Decrease) in Operating Assets - Total</label>
    <loc xlink:type="locator" xlink:href="../../pte/2005-02-28/usfr-pte-2005-02-28.xsd#usfr-pte_ChangeCurrentLiabilitiesAbstract" xlink:label="usfr-pte_ChangeCurrentLiabilitiesAbstract" />
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="usfr-pte_ChangeCurrentLiabilitiesAbstract" xlink:to="usfr-pte_ChangeCurrentLiabilitiesAbstract_lbl_1" priority="1" />
    <label id="label_ChangeCurrentLiabilitiesAbstract_1108363710996_0" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="usfr-pte_ChangeCurrentLiabilitiesAbstract_lbl_1" xml:lang="en" xlink:title="label_ChangeCurrentLiabilitiesAbstract">Increase/(Decrease) in Operating Liabilities</label>
    <label id="label_ChangeCurrentLiabilitiesAbstract_1108363689526_1" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="usfr-pte_ChangeCurrentLiabilitiesAbstract_lbl_1" xml:lang="en" xlink:title="label_ChangeCurrentLiabilitiesAbstract">Operating Liabilities</label>
    <label id="label_ChangeCurrentLiabilitiesAbstract_1108363725818_0" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="usfr-pte_ChangeCurrentLiabilitiesAbstract_lbl_1" xml:lang="en" xlink:title="label_ChangeCurrentLiabilitiesAbstract">Increase/(Decrease) in Operating Liabilities - Total</label>
    <loc xlink:type="locator" xlink:href="../../pte/2005-02-28/usfr-pte-2005-02-28.xsd#usfr-pte_ChangeCurrentLiabilities" xlink:label="usfr-pte_ChangeCurrentLiabilities" />
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="usfr-pte_ChangeCurrentLiabilities" xlink:to="usfr-pte_ChangeCurrentLiabilities_lbl_1" priority="1" />
    <label id="label_ChangeCurrentLiabilities_1108365005848_2" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="usfr-pte_ChangeCurrentLiabilities_lbl_1" xml:lang="en" xlink:title="label_ChangeCurrentLiabilities">Increase/(Decrease) in Operating Liabilities</label>
    <label id="label_ChangeCurrentLiabilities_1108365067537_0" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="usfr-pte_ChangeCurrentLiabilities_lbl_1" xml:lang="en" xlink:title="label_ChangeCurrentLiabilities">Operating Liabilities</label>
    <label id="label_ChangeCurrentLiabilities_1108365035992_0" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="usfr-pte_ChangeCurrentLiabilities_lbl_1" xml:lang="en" xlink:title="label_ChangeCurrentLiabilities">Increase/(Decrease) in Operating Liabilities - Total</label>
    <loc xlink:type="locator" xlink:href="../../pte/2005-02-28/usfr-pte-2005-02-28.xsd#usfr-pte_ChangeOperatingAssetsLiabilitiesAbstract" xlink:label="usfr-pte_ChangeOperatingAssetsLiabilitiesAbstract" />
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="usfr-pte_ChangeOperatingAssetsLiabilitiesAbstract" xlink:to="usfr-pte_ChangeOperatingAssetsLiabilitiesAbstract_lbl_1" priority="1" />
    <label id="label_ChangeOperatingAssetsLiabilitiesAbstract_1108365700958_2" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="usfr-pte_ChangeOperatingAssetsLiabilitiesAbstract_lbl_1" xml:lang="en" xlink:title="label_ChangeOperatingAssetsLiabilitiesAbstract">Increase/(Decrease) in Operating Assets and Liabilities</label>
    <label id="label_ChangeOperatingAssetsLiabilitiesAbstract_1108365726334_0" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="usfr-pte_ChangeOperatingAssetsLiabilitiesAbstract_lbl_1" xml:lang="en" xlink:title="label_ChangeOperatingAssetsLiabilitiesAbstract">Operating Assets and Liabilities</label>
    <loc xlink:type="locator" xlink:href="../../pte/2005-02-28/usfr-pte-2005-02-28.xsd#usfr-pte_ChangeOperatingAssetsLiabilities" xlink:label="usfr-pte_ChangeOperatingAssetsLiabilities" />
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="usfr-pte_ChangeOperatingAssetsLiabilities" xlink:to="usfr-pte_ChangeOperatingAssetsLiabilities_lbl_1" priority="1" />
    <label id="label_ChangeOperatingAssetsLiabilities_1108363404506_2" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="usfr-pte_ChangeOperatingAssetsLiabilities_lbl_1" xml:lang="en" xlink:title="label_ChangeOperatingAssetsLiabilities">Increase/(Decrease) in Operating Assets and Liabilities</label>
    <label id="label_ChangeOperatingAssetsLiabilities_1108363430974_0" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="usfr-pte_ChangeOperatingAssetsLiabilities_lbl_1" xml:lang="en" xlink:title="label_ChangeOperatingAssetsLiabilities">Operating Assets and Liabilities</label>
    <label id="label_ChangeOperatingAssetsLiabilities_1108363482688_0" xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="usfr-pte_ChangeOperatingAssetsLiabilities_lbl_1" xml:lang="en" xlink:title="label_ChangeOperatingAssetsLiabilities">Increase/(Decrease) in Operating Assets and Liabilities - Total</label>
  </labelLink>
</linkbase>