Dedicated vizPlot link error

The following unexpected problem occured in VizieR:


Catalog not ready or inaccessible: Ion=H+

Problem report: Please insert in your message the input detailed below:

PATH_INFO=Vgraph/txt
cwd=/srv/httpd/cgi
'Ion=H+'
'coef=2'

CDS.headStuff2vizPlot@vizier.idia.ac.za