<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg
   xmlns:dc="http://purl.org/dc/elements/1.1/"
   xmlns:cc="http://creativecommons.org/ns#"
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:svg="http://www.w3.org/2000/svg"
   xmlns="http://www.w3.org/2000/svg"
   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
   width="372.04724"
   height="524.40942"
   id="svg2"
   sodipodi:version="0.32"
   inkscape:version="0.46"
   sodipodi:docname="Creep.svg"
   inkscape:output_extension="org.inkscape.output.svg.inkscape"
   version="1.0">
  <defs
     id="defs4">
    <marker
       inkscape:stockid="Arrow2Lstart"
       orient="auto"
       refY="0"
       refX="0"
       id="Arrow2Lstart"
       style="overflow:visible">
      <path
         id="path5412"
         style="font-size:12px;fill-rule:evenodd;stroke-width:0.625;stroke-linejoin:round"
         d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.97309,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z"
         transform="matrix(1.1,0,0,1.1,1.1,0)" />
    </marker>
    <marker
       inkscape:stockid="Arrow1Lstart"
       orient="auto"
       refY="0"
       refX="0"
       id="Arrow1Lstart"
       style="overflow:visible">
      <path
         id="path5394"
         d="M 0,0 L 5,-5 L -12.5,0 L 5,5 L 0,0 z"
         style="fill-rule:evenodd;stroke:#000000;stroke-width:1pt;marker-start:none"
         transform="matrix(0.8,0,0,0.8,10,0)" />
    </marker>
    <marker
       inkscape:stockid="Arrow1Lend"
       orient="auto"
       refY="0"
       refX="0"
       id="Arrow1Lend"
       style="overflow:visible">
      <path
         id="path5397"
         d="M 0,0 L 5,-5 L -12.5,0 L 5,5 L 0,0 z"
         style="fill-rule:evenodd;stroke:#000000;stroke-width:1pt;marker-start:none"
         transform="matrix(-0.8,0,0,-0.8,-10,0)" />
    </marker>
    <marker
       inkscape:stockid="Arrow2Lend"
       orient="auto"
       refY="0"
       refX="0"
       id="Arrow2Lend"
       style="overflow:visible">
      <path
         id="path3181"
         style="font-size:12px;fill-rule:evenodd;stroke-width:0.625;stroke-linejoin:round"
         d="M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.97309,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z"
         transform="matrix(-1.1,0,0,-1.1,-1.1,0)" />
    </marker>
    <inkscape:perspective
       sodipodi:type="inkscape:persp3d"
       inkscape:vp_x="0 : 526.18109 : 1"
       inkscape:vp_y="0 : 1000 : 0"
       inkscape:vp_z="744.09448 : 526.18109 : 1"
       inkscape:persp3d-origin="372.04724 : 350.78739 : 1"
       id="perspective10" />
  </defs>
  <sodipodi:namedview
     id="base"
     pagecolor="#ffffff"
     bordercolor="#666666"
     borderopacity="1.0"
     gridtolerance="10000"
     guidetolerance="10"
     objecttolerance="10"
     inkscape:pageopacity="0.0"
     inkscape:pageshadow="2"
     inkscape:zoom="1"
     inkscape:cx="108.30591"
     inkscape:cy="287.01254"
     inkscape:document-units="px"
     inkscape:current-layer="layer2"
     showgrid="true"
     showguides="true"
     inkscape:snap-global="true"
     inkscape:guide-bbox="true"
     inkscape:window-width="1280"
     inkscape:window-height="744"
     inkscape:window-x="-4"
     inkscape:window-y="-4"
     units="in">
    <inkscape:grid
       type="xygrid"
       id="grid2383"
       visible="true"
       enabled="true" />
  </sodipodi:namedview>
  <metadata
     id="metadata7">
    <rdf:RDF>
      <cc:Work
         rdf:about="">
        <dc:format>image/svg+xml</dc:format>
        <dc:type
           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
      </cc:Work>
    </rdf:RDF>
  </metadata>
  <g
     inkscape:label="axes"
     inkscape:groupmode="layer"
     id="layer1">
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Lend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       d="M 44.460661,223.06315 L 45.415198,48.383484"
       id="path2385" />
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Lend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       d="M 44.282582,223.37917 L 307.1198,224.30811"
       id="path3937" />
  </g>
  <g
     inkscape:groupmode="layer"
     id="layer2"
     inkscape:label="axis labels">
    <text
       xml:space="preserve"
       style="font-size:19.55576324px;font-style:normal;font-weight:normal;line-height:125%;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
       x="22.595875"
       y="61.427147"
       id="text3939"
       sodipodi:linespacing="125%"><tspan
         sodipodi:role="line"
         id="tspan3943"
         x="22.595875"
         y="61.427147">σ</tspan></text>
    <text
       xml:space="preserve"
       style="font-size:16.62239838px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial;-inkscape-font-specification:Arial"
       x="319.36636"
       y="230.69942"
       id="text3945"
       sodipodi:linespacing="125%"><tspan
         sodipodi:role="line"
         id="tspan3974"
         x="319.36636"
         y="230.69942">time</tspan></text>
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.97778827;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       d="M 74.235049,213.4801 L 74.235049,231.61624"
       id="path3976" />
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.97778827;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       d="M 177.08112,213.69252 L 177.08112,231.82867"
       id="path3978" />
    <text
       xml:space="preserve"
       style="font-size:16.62239838px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial;-inkscape-font-specification:Arial"
       x="68.135803"
       y="248.20445"
       id="text3980"
       sodipodi:linespacing="125%"><tspan
         sodipodi:role="line"
         id="tspan3982"
         x="68.135803"
         y="248.20445">t0</tspan></text>
    <text
       xml:space="preserve"
       style="font-size:16.62239838px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial;-inkscape-font-specification:Arial"
       x="172.01387"
       y="247.70267"
       id="text3984"
       sodipodi:linespacing="125%"><tspan
         sodipodi:role="line"
         id="tspan3986"
         x="172.01387"
         y="247.70267">t1</tspan></text>
    <text
       xml:space="preserve"
       style="font-size:19.55576324px;font-style:normal;font-weight:normal;line-height:125%;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
       x="10.678812"
       y="96.145508"
       id="text3992"
       sodipodi:linespacing="125%"><tspan
         sodipodi:role="line"
         id="tspan3994"
         x="10.678812"
         y="96.145508">σ0</tspan></text>
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.97778827;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       d="M 54.679281,91.256567 L 36.54314,91.256567"
       id="path3996" />
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-miterlimit:4;stroke-dasharray:none"
       d="M 73.673026,222.94567 L 73.967648,91.199013 L 176.75724,91.199013 L 176.75724,223.31553"
       id="path3998" />
    <path
       sodipodi:type="arc"
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1.27639125;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       id="path2475"
       sodipodi:cx="125"
       sodipodi:cy="312.36218"
       sodipodi:rx="195"
       sodipodi:ry="80"
       d="M -70,312.36218 A 195,80 0 0 1 125.44667,232.36239"
       sodipodi:start="3.1415927"
       sodipodi:end="4.7146796"
       sodipodi:open="true"
       transform="matrix(0.5251002,0,0,1.1689345,111.26528,64.087459)" />
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Lend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       d="M 44.460661,467.5102 L 45.415198,292.83054"
       id="path3285" />
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Lend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       d="M 44.282582,467.82622 L 307.1198,468.75517"
       id="path3287" />
    <text
       xml:space="preserve"
       style="font-size:19.55576324px;font-style:normal;font-weight:normal;line-height:125%;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
       x="22.595875"
       y="305.87418"
       id="text3289"
       sodipodi:linespacing="125%"><tspan
         sodipodi:role="line"
         id="tspan3291"
         x="22.595875"
         y="305.87418">ε</tspan></text>
    <text
       xml:space="preserve"
       style="font-size:16.62239838px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial;-inkscape-font-specification:Arial"
       x="319.36636"
       y="475.14645"
       id="text3293"
       sodipodi:linespacing="125%"><tspan
         sodipodi:role="line"
         id="tspan3295"
         x="319.36636"
         y="475.14645">time</tspan></text>
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.97778827;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       d="M 74.235049,457.92715 L 74.235049,476.06329"
       id="path3297" />
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.97778827;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       d="M 177.08112,458.13957 L 177.08112,476.27572"
       id="path3299" />
    <text
       xml:space="preserve"
       style="font-size:16.62239838px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial;-inkscape-font-specification:Arial"
       x="68.135803"
       y="492.65149"
       id="text3301"
       sodipodi:linespacing="125%"><tspan
         sodipodi:role="line"
         id="tspan3303"
         x="68.135803"
         y="492.65149">t0</tspan></text>
    <text
       xml:space="preserve"
       style="font-size:16.62239838px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Arial;-inkscape-font-specification:Arial"
       x="172.01387"
       y="492.14972"
       id="text3305"
       sodipodi:linespacing="125%"><tspan
         sodipodi:role="line"
         id="tspan3307"
         x="172.01387"
         y="492.14972">t1</tspan></text>
    <text
       xml:space="preserve"
       style="font-size:19.55576324px;font-style:normal;font-weight:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
       x="10.678814"
       y="433.48245"
       id="text3309"
       sodipodi:linespacing="125%"><tspan
         sodipodi:role="line"
         id="tspan3317"
         x="10.678814"
         y="433.48245">ε0</tspan></text>
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.97778827;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       d="M 54.679281,428.5935 L 36.54314,428.5935"
       id="path3313" />
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-miterlimit:4;stroke-dasharray:none"
       d="M 74.235049,467.70503 L 74.688101,428.28944"
       id="path3319" />
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-miterlimit:4;stroke-dasharray:none"
       d="M 176.90281,374.81515 L 177.35586,335.39956"
       id="path3321" />
    <path
       sodipodi:type="arc"
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1.14568671;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
       id="path3323"
       sodipodi:cx="125"
       sodipodi:cy="312.36218"
       sodipodi:rx="195"
       sodipodi:ry="80"
       d="M -70,312.36218 A 195,80 0 0 1 125.44667,232.36239"
       sodipodi:start="3.1415927"
       sodipodi:end="4.7146796"
       sodipodi:open="true"
       transform="matrix(0.6523691,0,0,-1.1678172,222.61334,734.75286)" />
    <text
       xml:space="preserve"
       style="font-size:19.55576324px;font-style:normal;font-weight:normal;text-align:start;line-height:125%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
       x="202.13666"
       y="362.47992"
       id="text3325"
       sodipodi:linespacing="125%"><tspan
         sodipodi:role="line"
         id="tspan3327"
         x="202.13666"
         y="362.47992">ε0</tspan></text>
    <path
       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.48889413px;stroke-linecap:butt;stroke-linejoin:miter;marker-start:url(#Arrow2Lstart);marker-end:url(#Arrow2Lend);stroke-opacity:1"
       d="M 191.56963,335.70362 L 191.56963,374.81515"
       id="path3329" />
    <text
       xml:space="preserve"
       style="font-size:19.55576324px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
       x="15.567754"
       y="37.478222"
       id="text7239"><tspan
         sodipodi:role="line"
         id="tspan7241"
         x="15.567754"
         y="37.478222">a)</tspan></text>
    <text
       xml:space="preserve"
       style="font-size:19.55576324px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
       x="15.567754"
       y="281.92526"
       id="text7243"><tspan
         sodipodi:role="line"
         id="tspan7245"
         x="15.567754"
         y="281.92526">b)</tspan></text>
  </g>
</svg>
