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OCR: TITLE {grav4 pde} 'Interor of the Earth DEFINITIONS r1= 6.37e6 m1= 98e24 units rad= sqrtx^2+y^2) 6.67e-11* m1/(2*r1 [3- rad^2/r1^2] OX= -dU gy= -dyU gm= sqrt(gx^2+gy^2) laplace U= 1/x^2 dx[x^2*dxU] Spherical coordinates BOUNDARIES region start(r1,0) arc to0,r1 to-r1,0) to0-r1 to finish PLOTS contour( U elevation( U) from 0,0 to(r1,0) vector( gy) elevation( gm) from 0,0 to (r1,0 elevation( laplace U from 0,0tor1,0 surface( gm) END Interior