The Active Surface Manager FITS keywords for the ZERNIKE table conforms to the definition for common FITS headers as described in GBT Software Project Note 4.0 ``Device and Log FITS Files for the GBT.''
SURFACE Binary Table Extension: Header
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XTENSION= 'BINTABLE' / binary table extension
BITPIX = 8 / 8-bit bytes
NAXIS = 2 / 2-dimensional binary table
NAXIS1 = 12 / width of table in bytes
NAXIS2 = 36 / number of rows in table
PCOUNT = 0 / size of special data area
GCOUNT = 1 / one data group (required keyword)
TFIELDS = 2 / number of fields in each row
TTYPE1 = 'Name ' / label for field 1
TFORM1 = '1J ' / data format of field: 4-byte INTEGER
TUNIT1 = 'none ' / physical unit of field
TTYPE2 = 'Value ' / label for field 2
TFORM2 = '1D ' / data format of field: 8-byte DOUBLE
TUNIT2 = 'none ' / physical unit of field
EXTNAME = 'ZERNIKE ' / name of this binary table extension
ZERNCLIP= F / Clipping enabled = T, F = disabled
ZERNLIM = 4.000E+04 / Maximum actuator zernike displacement used
END
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ZERNIKE Binary Tables Extension: Data (complete)
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Name Value
1J 1D
none none
1 0 0 0.000000E+00
2 1 0 0.000000E+00
.
.
.
36 35 0 0.000000E+00
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The column ZERNCLIP in the header indicates whether zernike limiting was enabled.
The column ZERNLIM in the header contains the value used as the limit for the zernike displacements.
The columns Name and Value identify the zernike polynomial designator and the value of the polonomial.