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welcome to todayamp;#39;s webinar today weamp;#39;ll be discussing challenges in analysis of heterogeneous samples and we will focus on application of small air XPS and imaging tools for addressing those challenges first I would like to share with you a few examples that introduces the challenges the first example shows a film in a glass presumably homogeneous sample and we would like to come to obtain average composition we are using large area which is 1,400 micron by a 100 micron area of analysis to extract atomic concentration so here is the output so we can have to look at the average and standard deviation and we can see that even for elements that are present in really small quantities standard deviation is pretty small so the large area spectra show homogeneity with small standard deviation order 5% therefore we can consider this composition as a representative of the sample chemistry the second example is very similar we have a film on a glass sample but in this case the sam