Exploring the low redshift universe: two parametric models for effective pressure Qiang Zhang, Guang Yang, Qixiang Zou, Xinhe Meng and Keji Shen Eur. Phys. J. C, 75 7 (2015) 300 Published online: 01 July 2015 DOI: 10.1140/epjc/s10052-015-3531-5