A virtual observatory for photoionized nebulae: the Mexican Million
  Models database (3MdB)
  Photoionization models obtained with numerical codes are widely used to study
the physics of the interstellar medium (Planetary Nebulae, H II regions, etc).
Grid of models are performed to understand what are the effects of the
different parameters used to describe the regions on the observables (mainly
emission line intensities). Most of the time, only a small part of the computed
results of such grids are published, and they are sometimes hard to obtain in a
user-friendly format. We present here the Mexican Million Models dataBase
(3MdB), an effort of resolving both of these issues in the form of a database
of photoionization models, easily accessible throught the MySQL protocol, and
containing a lot of usefull outputs from the models, such as the intensities of
178 emission lines, the ionic fractions of all the ions, etc. Some examples of
the use of the 3MdB are also presented.
