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Missing character: There is no e in font nullfont!
Missing character: There is no t in font nullfont!
Missing character: There is no r in font nullfont!
Missing character: There is no u in font nullfont!
Missing character: There is no e in font nullfont!
 [4] (./barchart_doc.aux) ) 
Here is how much of TeX's memory you used:
 10169 strings out of 493315
 195609 string characters out of 6137904
 241784 words of memory out of 5000000
 13426 multiletter control sequences out of 15000+600000
 8698 words of font info for 32 fonts, out of 8000000 for 9000
 957 hyphenation exceptions out of 8191
 63i,8n,57p,432b,830s stack positions out of 5000i,500n,10000p,200000b,80000s
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amsfonts/cm/cmr12.pfb></usr/local/texlive/2013/texmf-dist/fonts/type1/public/am
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cm/cmtt9.pfb>
Output written on barchart_doc.pdf (4 pages, 94660 bytes).
PDF statistics:
 52 PDF objects out of 1000 (max. 8388607)
 37 compressed objects within 1 object stream
 0 named destinations out of 1000 (max. 500000)
 13 words of extra memory for PDF output out of 10000 (max. 10000000)