The normal distribution (histograms and fitting curves) of soil mass (pi) at different particle grades for soil samples from XC, MLP, DF, TMD, JSR, Moon

The corresponding Normal distribution curves of soils from XC, MLP, DF, TMD, JSR, and the Moon.

取自XC、MLP、DF、TMD、JSR以及月球的土壤所对应的正态分布（Normal distribution）曲线。