Open XML

In the example XML below, where (how) would I find the font properties for the text element within the run? Specifically, where (how) can I find the data which tells me to apply Calibri Light font, font size 44. to the run?

<p:sp xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main"><p:nvSpPr><p:cNvPr id="2" name="Title 1" /><p:cNvSpPr><a:spLocks noGrp="1" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" /></p:cNvSpPr><p:nvPr><p:ph type="title" /></p:nvPr></p:nvSpPr><p:spPr /><p:txBody><a:bodyPr xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" /><a:lstStyle xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" /><a:p xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><a:r><a:rPr lang="en-US" dirty="0" smtClean="0" /><a:t>Slide 4 title – Calibri Light (Heading) 44 font </a:t></a:r><a:endParaRPr lang="en-US" dirty="0" /></a:p></p:txBody></p:sp>

Any assistance appreciated.

Thanks.