Data Item _em_map_resolution.nyquist_frequency
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General 
- Item name
- _em_map_resolution.nyquist_frequency
- Category name
- em_map_resolution
- Attribute name
- nyquist_frequency
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
The Nyquist frequency is double the sampling step. e.g. for data
sampled at 5 angstroms the Nyquist frequency is 1/10 angstroms.
It is important to have the sampling rate of the data high enough
so that the image information stays sufficiently away from the
Nyquist frequency, otherwise there is a danger that the high-
resolution information in both of the reconstruction volumes
may be correlated.
Data Type 
- Data type code
- float
- Data type detail
- int item types are the subset of numbers that are the floating numbers.
- Primitive data type code
- numb
- Regular expression
- -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?