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Explaination about the results of "coor volume" command

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StevenWang Posted: 01-10-2009 11:50 AM

The general results (see the output file of your input file) of the "coor volume [hole] space @### sele ### end" is listed as follows:

A TOTAL OF   ####  VACUUM POINTS WERE FOUND
 A TOTAL OF  #### OCCUPIED POINTS WERE FOUND
 A TOTAL OF  #### EXTERNAL POINTS WERE FOUND
 A TOTAL OF  #### SELECTED POINTS WERE FOUND
 TOTAL OCCUPIED  VOLUME =   ######
 TOTAL SELECTED  VOLUME =   ######
 TOTAL FREE      VOLUME =      ######
 FRACTIONAL FREE VOLUME =      ######

(1) If the [hole] option is used, then:

TOTAL OCCUPIED  VOLUME =  the volume occupied by the atoms selected

TOTAL SELECTED  VOLUME =  the volume occupied by the atoms selected + the volume filled by charmm*

TOTAL FREE      VOLUME =  non-occupied volume (made up of integral cubic pixels)

FRACTIONAL FREE VOLUME = non-occupied volume (made up of fractional cubic pixels)

 

(2) if the [hole] option is  NOT used, then:

TOTAL OCCUPIED  VOLUME =  the volume occupied by the atoms selected

TOTAL SELECTED  VOLUME =  the volume occupied by the atoms selected

TOTAL FREE      VOLUME =  non-occupied volume (made up of integral cubic pixels) + the volume filled by charmm*

FRACTIONAL FREE VOLUME = non-occupied volume (made up of fractional cubic pixels)

 

* this volume filled is the inaccessible space within the molecule

Note: remember that the  substitution " ? VOLUME "  =  " TOTAL OCCUPIED  VOLUME ". Thus it does not change whether the [hole] option is used.  The [hole]  option  onl y change  the " TOTAL FREE  VOLUME " ., which is  substituted  by  " ?  FREEVOL ".

Example:

1.  [hole] option not used

A TOTAL OF 626789 VACUUM POINTS WERE FOUND

A TOTAL OF 466940 OCCUPIED POINTS WERE FOUND

A TOTAL OF 0 EXTERNAL POINTS WERE FOUND

A TOTAL OF 466940 SELECTED POINTS WERE FOUND

TOTAL OCCUPIED VOLUME = 50287.839248

TOTAL SELECTED VOLUME = 50287.839248

TOTAL FREE VOLUME = 67503.029242

FRACTIONAL FREE VOLUME = 57.307523

2. [hole] option is used

A TOTAL OF 770 VACUUM POINTS WERE FOUND

A TOTAL OF 466940 OCCUPIED POINTS WERE FOUND

A TOTAL OF 626019 EXTERNAL POINTS WERE FOUND

A TOTAL OF 1092959 SELECTED POINTS WERE FOUND

TOTAL OCCUPIED VOLUME = 50287.839248

TOTAL SELECTED VOLUME = 117707.942126

TOTAL FREE VOLUME = 82.926364

FRACTIONAL FREE VOLUME = 0.164632

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