Production Service Center ("PSC") revenue for the 2013 second quarter was approximately $3.4 million, up 6%, or $0.2 million, over the prior-year second quarter. PSC revenue represented 37% of total revenue in the 2013 second quarter.Reduced Operating Loss—Driven by Machine Sales Volume Gross profit was $4.2 million in the second quarter of 2013, an improvement of $2.7 million compared with gross profit of $1.5 million in the second quarter of 2012. Gross profit as a percent of sales was 45.3% in the second quarter of 2013 compared with 32.6% in the second quarter of 2012. Gross profit and gross margin for the second quarter of 2013 improved on volume, favorable sales mix and enhanced productivity in the Company's PSCs. Operating loss for the second quarter of 2013 was $1.0 million compared with an operating loss of $3.1 million in the second quarter of 2012, an improvement of $2.1 million. Selling, general and administrative ("SG&A") expenses for the second quarter of 2013 were $3.9 million, compared with $4.3 million in the prior-year second quarter. The 2012 second quarter SG&A included a $1.8 million equity-based compensation charge. Research and development ("R&D") expenses for the second quarter of 2013 increased by $0.9 million to $1.3 million, in support of the Company's materials qualification and machine technology enhancements. Adjusted earnings before interest, taxes, depreciation and amortization ("EBITDA") was a loss of $0.3 million in the second quarter of 2013, improved from a loss of $2.7 million in the second quarter of 2012. ExOne management believes that when used in conjunction with other measures prepared in accordance with accounting principles generally accepted in the United States ("GAAP"), that Adjusted EBITDA, a non-GAAP measure, assists in the understanding of operating performance. See the attached tables for important disclosures regarding the Company's use of Adjusted EBITDA as well as a reconciliation of net loss attributable to ExOne to Adjusted EBITDA for both the quarter and six-month periods ended June 30, 2013 and 2012. First Half 2013 Review—Demonstrates Favorable Momentum Revenue for the six-month period ended June 30, 2013 was $17.2 million, up $9.8 million, or 132%, compared with $7.4 million in the prior-year period, driven primarily by machine sales as well as growth in PSC revenue globally.