Yes — the authors headline hour 14 / −0.26: the results text singles it out as the largest own elasticity of all 24 hours and builds the interpretation around it, and the Conclusions repeat "own price elasticities as large as 0.26 in absolute value for the aggregate of our population" (p. 256); no other single hourly diagonal value is individually discussed. || "The greatest response of the boxed hours is −0.26 in hour 14 (2 PM), which is also the largest own elasticity for any of the 24 h." (p. 243, printed)
Taylor, T. N., Schwarz, P. M., & Cochell, J. E. (2005): '24/7 Hourly Response to Electricity Real-Time Pricing with up to Eight Summers of Experience.' Journal of Regulatory Economics, 27(3), 235-262.