The information of IGS experimental combined GIM , i.e. IRTG, can be seen as follow:

1. root website:	http://chapman.upc.es/irtg

2. previous results:	http://chapman.upc.es/irtg/archive/

(Before 2021/024, we only have daily ionex file. And due to the interruption of Internet or something else, some epoch was lost. So some daily ionex files have irregular time interval. 
And we warned that in the header of ionex file as "                 warning: irregular time interval           DESCRIPTION".)

yy:	2-digit year
year:	4-digit year
doy:	day of year

2.1 daily ionex file can be found at:
http://chapman.upc.es/irtg/archive/${year}/${doy}/global_vtec_movie_since_last_midnight/ionex_file/irtg${doy}0.${yy}i.Z

2.2 daily ionex file animatation of heat map:
http://chapman.upc.es/irtg/archive/${year}/${doy}/global_vtec_movie_since_last_midnight/irtg${yy}${doy}.tec0.global.hot.anim.gif

2.3 single epoch ionex file can be found at:
http://chapman.upc.es/irtg/archive/${year}/${doy}/global_vtec_snapshots_since_last_midnight/ionex_file/irtg${doy}0.${hour}.${decimal_of_hour}.${yy}i.Z

for example:
irtg0240.03.67.21i.Z
doy 			024
hour			03
decimal_of_hour 	67
yy			21

2.4 single epoch ionex file plot of heat map:
http://chapman.upc.es/irtg/archive/${year}/${doy}/global_vtec_snapshots_since_last_midnight/irtg${yy}${doy}.${hour}${minute}.tec0.global.gif	


3. latest results:	http://chapman.upc.es/irtg/last_results/

MOST-RECENT-RT-DAILY-IONEX-FILE.Z			most recent daily irtg ionex file
MOST-RECENT-RT-SNAPSHOT-IONEX-FILE.Z			most recent single epoch ionex file
RT-DAILY-VTEC-MOVIE.gif					most recent daily irtg ionex file animatation of heat map
irtg${doy}0.${yy}i.Z					most recent daily irtg ionex file
irtg${yy}${doy}.tec0.global.hot.anim.gif		most recent daily irtg ionex file animatation of heat map
irtg${doy}0.${hour}.${decimal_of_hour}.${yy}i.Z		most recent single epoch ionex file
irtg${yy}${doy}.${hour}${minute}.tec0.global.gif	most recent single epoch ionex file plot of heat map


If you have any question, please don't hesitate to contact us.

Manuel Hernandez Pajares
manuel.hernandez@upc.edu

Qi Liu
q.liu@upc.edu