Version 6.0.3 reports lower resolutions for same Alpy data

Version 6.0.3 reports lower resolutions for same Alpy data

Postby John Coffin » Sun Jan 24, 2021 4:46 pm

Hi, I upgraded my ISIS from version 6.0 to 6.0.3 today.
I was surprised to find that my Alpy spectrum was reported as having a resolution of 455. I reinstalled version 6.0 and processed the same data and the resolution was 527.
Then I went back and reprocessed some more data and found a similar discrepancy between the two versions.
Does anyone know why this should be?
Thanks, John
John Coffin
 
Posts: 13
Joined: Tue Nov 27, 2018 5:43 pm

Re: Version 6.0.3 reports lower resolutions for same Alpy da

Postby Robin Leadbeater » Mon Jan 25, 2021 3:57 pm

I can confirm this.

I see a difference between 6.0.3 and 5.9.3 (my standard as I prefer the black body correction to the response) 5.9.3 gave R=537 and 6.0.3 gave 522 using the same data and the same xml file so the settings should have been identical

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
Posts: 1664
Joined: Mon Sep 26, 2011 4:41 pm

Re: Version 6.0.3 reports lower resolutions for same Alpy da

Postby Robin Leadbeater » Mon Jan 25, 2021 4:08 pm

Comparing the log files I see there is a difference in the X1, X2 limits. I do not know what these are or how they are used but perhaps they have something to do with it?

ISIS_593-603_log.png
ISIS_593-603_log.png (6.33 KiB) Viewed 1023 times



Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
Posts: 1664
Joined: Mon Sep 26, 2011 4:41 pm

Re: Version 6.0.3 reports lower resolutions for same Alpy da

Postby John Coffin » Mon Jan 25, 2021 11:26 pm

Thanks Robin, I’ve emailed me to see if you can send me a copy of v 5.9.3
John
John Coffin
 
Posts: 13
Joined: Tue Nov 27, 2018 5:43 pm

Re: Version 6.0.3 reports lower resolutions for same Alpy da

Postby Robin Leadbeater » Tue Jan 26, 2021 12:33 am

Hi John,

You can download previous versions of ISIS from Christian's website here
http://www.astrosurf.com/buil/isis/download/

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
Posts: 1664
Joined: Mon Sep 26, 2011 4:41 pm


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