LSFit 2 variables  Chose a power 1 to 6.
  Provide data in form below to get the least square polynomial
  fit of your data. Or, click on Browse and get your data from a file.

  x and y denote independent variables, u denotes output
  
  u = c0 + c1*x + c2*y                             for first power,  at least 3 data
  u = c0 + c1*x + c2*y + c3*x*x + c4*x*y + c5*y*y  for second power, at least 6 data
  u = c0 + c1*x + c2*y + c3*x*x + c4*x*y + c5*y*y +
      c6*x*x*x + c7*x*x*y + c8*x*y*y + c9*y*y*y    for third power,  at least 10 data
      c0 to c14                                    for fourth power, at least 15 data
      c0 to c20                                    for fifth power,  at least 21 data
      c0 to c27                                    for sixth power,  at least 28 data

power

enter your data  x  y  u  each floating point number followed by a space
fit 
 

data