Data Item _em_micrographs.field_size
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General 
- Item name
- _em_micrographs.field_size
- Category name
- em_micrographs
- Attribute name
- field_size
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
Field size refers to the width of each small image cropped.
An _em_micrographs.averaging_overlap implies that the
successive images have an overalp of
(1-_em_micrographs.averaging_overlap)*field size.
A higher value of _em_micrographs.averaging_overlap means
a greater number of smaller images are used for averaging.
If the signal to noise ratio is very low, the averaging overlap
should be changed for better estimate of power spectrum.
Data Type 
- Data type code
- text
- Data type detail
- text item types / multi-line text ...
- Primitive data type code
- char
- Regular expression
- [][ \n\t()_,.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*