Fig. 7From: Study on the linear absent section ratio (L-ASR) of earthen sites and anthropogenic influence from the perspective of population densityThe correlation graphs between PDr and L-ASR: a Clark model, b Smeed model, c Newling model, and d Cubic model. * and ** represent the values of significance at 90% and 95% levels by the Student’s t-test, respectivelyBack to article page