| | \n\n \n \n \n float da= | \tangle sampling. \n | \n \n\n \n \n \n float dr=dvx | \tradius sampling. \n | \n \n\n \n \n \n float dt=2. | \tpolar angle sampling. \n | \n \n\n \n \n \n int extend=4 | \ttmp extension \n | \n \n\n \n \n \n int na= | \tnumber of angle values. \n | \n \n\n \n \n \n int nr=nvx/2 | \tnumber of radius on radial lines \n | \n \n\n \n \n \n int nt=180 | \tnumber of polar angle for integration. \n | \n \n\n \n \n \n float oa= | \tangle origin \n | \n \n\n \n \n \n float ot=0. | \tpolar angle origin \n | \n \n\n \n \n \n float s0= | \treference slowness \n | \n \n |