Output the function on the grid to an xyz file
| GRID | the action that creates the grid you would like to output | 
| STRIDE | ( default=0 ) the frequency with which the grid should be output to the file. The default value of 0 ensures that the grid is only output at the end of the trajectory | 
| FILE | ( default=density ) the file on which to write the grid. | 
| UNITS | ( default=PLUMED ) the units in which to print out the coordinates. PLUMED means internal PLUMED units | 
| COMPONENT | if your input is a vector field use this to specifiy the component of the input vector field for which you wish to output | 
| PRECISION | The number of digits in trajectory file  |