HST Solves Missing Water Problem in Hot Jupiters

(^ because it's a pretty picture)

http://www.astronomy.com/news/2015/12/hubble-solves-missing-water-mystery-for-hot-jupiters

My understanding is that hot Jupiters with clouds have flat spectra, which hides the water underneath. Hot Jupiters with clear atmospheres express water absorption lines better.
I thought we knew this already?

From wich paper is it?

I found a link to the paper on this site.
http://www.spacetelescope.org/news/heic1524/

On the arXiv here:

Sing et al. (2015) "A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion"
http://arxiv.org/abs/1512.04341