  The European FP7 project DIANA has performed a coherent analysis of a large
set of observations from protoplanetary disks by means of thermo-chemical disk
models. The collected data include extinction-corrected stellar UV and X-ray
input spectra (as seen by the disk), photometric fluxes, low and high
resolution spectra, interferometric data, emission line fluxes, line velocity
profiles and line maps. We define and apply a standardized modelling procedure
to simultaneously fit all these data by state-of-the-art modelling codes
(ProDiMo, MCFOST, MCMax) which solve the continuum and line radiative transfer,
disk chemistry, and the heating & cooling balance for both the gas and the
dust. We allow for up to two radial disk zones to obtain our best-fitting
models that have about 20 free parameters. This approach is novel and unique in
its completeness and level of consistency. In this paper, we present the
results from pure SED fitting for 27 objects and from the all inclusive
DIANA-standard models for 14 objects. We fit most infrared to millimeter
emission line fluxes within a factor better than 3, simultaneously with SED,
PAH features and radial brightness profiles extracted from images at various
wavelengths. Our analysis shows a number of Herbig Ae and T Tauri stars with
very cold and massive outer disks which are situated at least partly in the
shadow of a tall and gas-rich inner disk. The disk masses derived are often in
excess to previously published values, since these disks are partially
optically thick even at millimeter wavelength and so cold that they emit less
than in the Rayleigh-Jeans limit. Some line observations cannot be reproduced
by the models, probably caused by foreground cloud absorption or object
variability. Our data collection, the fitted physical disk parameters as well
as the full model output are available at an online database
(http://www.univie.ac.at/diana).
