Analysis of the image of pion-emitting sources in the source center-of-mass frame Yanyu Ren, Qichun Feng, Weining Zhang, Lei Huo, Jingbo Zhang, Jianli Liu and Guixin Tang Eur. Phys. J. A, 53 8 (2017) 163 Published online: 11 August 2017 DOI: 10.1140/epja/i2017-12351-1