Column

Select the column to be edited by clicking on the downward arrow button to the right. Note changes will not be made unless the Apply button is pressed.

Column Parameters

This changes the TDISP keyword in the header of the CHDU. If the TDISP keyword does not exist, the entry field appear blank. A new TDISP keyword will be inserted when a value is entered and the Apply button pressed. If the TDISP keyword field is blank when Apply is clicked, a pre-existing keyword will be deleted.

The allowed forms of the TDISP keyword for standard FITS files are:

  • Aw -- character string
  • Lw -- logical (T, F or U (undefined))
  • Iw.m -- integers
  • Bw.m -- Binary integers
  • Ow.m -- Octal integers
  • Zw.m -- Hexadecimal integers
  • Fw.d -- Floating-points
  • Ew.dEe, ENw.d, ESw.d -- Exponential form
  • Gw.dEe -- In either Floating-points form or exponential form
  • Dw.dEe -- Double precision
where w is the width of the displayed value in characters, m is the minimum number of digits to display (filled with leading 0s), d is the number of digits after the decimal point, and e is the number of digits in the exponent.

Column Units

This changes the TUNIT keyword in the header of the CHDU. If the TUNIT keyword does not exist, the entry field appear blank. A new TUNIT keyword will be inserted when a value is entered and the Apply button pressed. If the TUNIT keyword field is blank when Apply is clicked, a pre-existing keyword will be deleted.

New Name

This changes the TTYPE keyword in the header of the CHDU, only if the new name is different from the current one. A column name cannot be blank.


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Last modified: Thursday, 16-Jul-2009 14:09:24 EDT