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# mappage

Creates a standard electron density file from external file formats. Example of reading in a CCP4 map. It has been edited to remove excess CCP4 listings.

    % ../bin/mappage
              *** Mappage program ****
    Input map name from your crystallographic system: ano1.E
    O style map name: q.map

     Fourier parameters as read from the data-set
              Origin ................................    0    0    0
              Extent ................................   76   84   48
              Grid ..................................   76   84   48
              uvw (fast, medium, slow) ..............    Z    X    Y

    Do you wish to explicitly define Prod/Plus (y,[n])? n
    Cell constants ....................  91.800  99.500  56.500  90.000  90
    .000  90.000
    Fourier type ......................N
    Number of pages along x , y \& z    10   11    6

     Byte =    327.670 * density +         18
    vega [32]#  di q.map
    -rw-r-----   1 alwyn    oteam     394752 Dec 15 15:48 q.map
    vega [33]#

Notice the program decided on the prod and plus values. These numbers are to force the floating point number into a byte (i.e. an integer with values 1-255) via

    byte_value = density_value * prod + plus

Any values outside the range are truncated. The plus value is therefore important when negative values are to be contoured, and the prod values is important for scaling.