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                        RELEASE NOTES FOR HEASOFT 6.26.1
                                  June 26, 2019
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HEASoft 6.26.1 is a patch-level release that includes updates to NICER
and Swift data analysis software only. (Though it also includes a patch
to rbnrmf applied previously to the 6.26 downloads.)

Please see the download page for information
about patching existing HEASOFT 6.26 installations.

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                                     NICER
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NICERDAS Version 6a:

- nicerl2: (v1.9) Split nicermergeclean around niprefilter2 call to resolve
  "chicken-and-egg" dependency problem; improved handling of conflicts
  between e.g. file and file.gz

- nicermergeclean: (v1.6) Added 'nomerge' option to skip merging of ufa files
  into mpu7 file

- nimpucal: (v1.8) Erase conflicting evt.gz output if clobber=YES

- niprefilter2: (v1.9) Hidden parameters ufpat, ufapat, hkpat, mkfpat now
  use explicit path and can use shortcut

- Improved Perl error handling in most tasks

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                                     SWIFT
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XRT:

- xrtwtcorr: (v0.2.5) Modified 'ftsort' call to fix errors when running
  xrtcalcpi on WT mode data in settling mode