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> 
> /*! A list of several protein density value references that have been proposed in the literature.
>  *  These constants are meant to be used with the set_used_protein_density() function to set the
>  *  protein density to one of these reference values
>  *  - HARPAZ and al (1994)           Computed value  0.826446=1/1.21 Da/A3
>  *  - ANDERSSON and Hovmšller (1998) Computed value  1.22 g/cm3 ~ 0.7347 Da/A3
>  *  - TSAI et al. (1999)             Computed value  1.40 g/cm3 ~ 0.84309 Da/A3
>  *  - QUILLIN and Matthews (2000)    Computed value  1.43 g/cm3 ~ 0.86116 Da/A3
>  *  - SQUIRE and Himmel (1979), Gekko and Noguchi (1979) Experimental value  1.37 g/cm3 ~ 0.82503 Da/A3
>  */
> IMPEMEXPORT enum ProteinDensityReference {
>   HARPAZ,
>   ANDERSSON,
>   TSAI,
>   QUILLIN,
>   SQUIRE
>  } ;
> 
> /*! returns the protein density value used for internal computations (in kDa/Angstrom^3)
>  */
> IMPEMEXPORT double get_used_protein_density();
> 
> //! sets the protein density value used for internal computations
> /*! sets the protein density value used for internal computations
>  * \param[in] densityValue : the protein density value that we wish to use in our computations (in kDa/Angstrom^3)
>  */
> IMPEMEXPORT double set_used_protein_density(double densityValue);
> 
> //! sets the protein density value used for internal computations
> /*! sets the protein density value used for internal computations
>  * \param[in] densityValue : a reference protein density value that we wish to
>  * use in our computations (in kDa/Angstrom^3).
>  *
>  * See ProteinDensityReference for authorized values.
>  */
> IMPEMEXPORT double set_used_protein_density(ProteinDensityReference densityValue);
> 
58,59c95,98
< //!
< /**
---
> 
> //! Compute an approximate molecular mass
> /** Compute an approximate molecular mass for the set of voxels with intensity
>  * under a given threshold
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< \note The method assumes 1.21 cubic A per dalton (Harpaz 1994).
---
> \return an approximate molecular mass for the set of voxels with intensity
> under the provided threshold (mass in Da)
> \note By default, the method assumes 1.21 cubic A per dalton (Harpaz 1994).
> this constant can be modified through the set_used_protein_density function.
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> //! Computes the threshold consider in an EM map to get a desired volume
> /** Computes the threshold consider in an EM map to get a desired volume
>  * (i.e, the set of voxels with intensity greater than the threshold occupies that volume)
> \param[in] m a density map
> \param[in] desiredVolume (in A^3)
>  */
> IMPEMEXPORT Float compute_threshold_for_approximate_volume(DensityMap* m, Float desiredVolume);
> 
> //! Computes the threshold to consider in an EM map to get a desired mass
> /** Computes the threshold to consider in an EM map to get a desired mass
>  * (only voxels with intensity greater than the threshold are considered)
> \param[in] m a density map
> \param[in] desiredMass (in Da)
> \note By default, the method assumes 1.21 cubic A per dalton (Harpaz 1994).
> this constant can be modified through the set_used_protein_density function.
>  */
> IMPEMEXPORT Float compute_threshold_for_approximate_mass(DensityMap* m, Float desiredMass);