### 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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