内含：1）在同一纬度下不同斜距时比较重力简易算法和拉普拉斯算法的误差曲线；2）在同一斜距不同纬度下两种重力算法的误差曲线。内含各自的运行程序。-Contains: 1) under the same latitude different slant distance compare gravity simple algorithm and error curve of the Laplace algorithm　2) in the same slope distance under different latitude error curves of two kinds of gravity algorithm. With their own to run the program.