Title "Type your title here";
Parameters a1,a2,a3,a4,a5,a6,a7,a8;
Variable x,y,z;
Function phi=(a1*x+a2*y+a3*z+a4)/(a5*x+a6*y+a7*z+a8);
Data;
-89.39151256059473 -137.02560212717475 294.21474132740184 -6.665485509226116
-89.00640294668285 -136.43527900566508 292.94722809047147 -19.16957832970101
-92.13506447504953 -141.23111160203118 303.2446077398585 -13.17279524801581
-88.62171346838292 -135.845599897592 291.6810976480241 -13.347693872435975
-90.46633114139622 -138.67315969716176 297.75229720565187 -13.332711172088075
-88.2863231752905 -135.33149005044686 290.5772258653532 -6.896349080393108
-93.44596784537251 -143.2405565538356 307.5591906902628 -7.063657410928997
-90.22568043395219 -138.3042733549881 296.96024230454583 -7.693632729837688
-89.2790025102939 -136.85313880323915 293.84443642486923 -7.618526585886272
-94.15101574482283 -144.32130359774754 309.8797184385722 -2.1551078001605433
-95.83952722105414 -146.9095728316125 315.43712487434533 -7.703847535440715
-88.91364351681958 -136.29309082285104 292.6419285057441 -7.306981690714153
-86.79813484746683 -133.0502902378758 285.67914402989595 -7.185234673807415
-92.65651132990632 -142.0304220423332 304.9608484334443 4.2052412033081055
-91.38782426489834 -140.08568921464072 300.78521222409256 -7.395631440470012