STN031 - MLO - emperical correction of Umkehr data after instrumental step function was discovered to shift data starting in July 2005
(stn031_8211all_update_2005_stray15.umk04xl2cor_rtoz), also JMA automation processing is still under ivestigation (from May 2010)
stn040 - OHP - corrections for clock time step error (stn040_8312cl)
stn067_ boulder - re-processed data in JMA automation system since 2009 (7811c)
stn159 - Perth, Australia - data have not been regualrly processed since 2009 (e08)
stn256 - Lauder, NeaZealand - JMA automation in February of 2011 - consistency of the dataset is still under evaluation

stn035 - Arosa, Switzerland - after 2007 data have not been submitted to WOUDc due to continuos work on homogenization 
(insturmental artifacts are still under investigation after 2007,
currently an emperical correction is applied to adjust for stray light changes after 2003) (stn035_5611tor_70.umk04xl2cory03xl2cor_toz)