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Short helpfile for action MULTICOLVARDENS
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The following arguments are compulsory: 

                 STRIDE - ( default=1 ) the frequency with which to accumulate the 
                          densities 
                  CLEAR - ( default=0 ) the frequency with which to clear the density 
                 ORIGIN - we will use the position of this atom as the origin 
                    DIR - the direction in which to calculate the density profile 
                 KERNEL - ( default=GAUSSIAN ) the kernel function you are using. 
                          More details on the kernels available in plumed plumed can be 
                          found in \ref kernelfunctions. 

In addition you may use the following options: 

            UNORMALIZED - ( default=off ) do not divide by the density 
              BANDWIDTH - the bandwidths for kernel density esimtation 
                  NBINS - the number of bins to use in each direction (alternative to 
                          GRID_NBIN) 
                   DATA - the multicolvar which you would like to calculate the 
                          density profile for 
                  ATOMS - if you are calculating a atomic density you use this 
                          keyword to specify the atoms that are involved 
          NORMALIZATION - set true/false to determine how to the data is normalised 


