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Creating a new FITS file

The following sequence of subroutine calls illustrate a simple example of writing a new FITS file:

1. Create the new file with FTINIT.
 2. Write the required primary array keywords with FTPHPR.
 3. Write any additional keywords with FTPKYx.
 4. Define the structure of the primary array with FTPDEF.
 5. Write the primary array data, if any, with FTPPRx.
 6. Create another extension, if desired, with FTCRHD.
 7. Write required header keywords for the extension with FTPHTB or FTPHBN.
 8. Write any additional keywords with FTPKYx
 9. Define the extension data structure with FTADEF or FTBDEF.
10. Write data to the extension, one column at a time with FTPCLx
11. Repeat steps 6 - 10 for any more extensions.
12. Close the FITS file with FTCLOS