  MPGD are the new frontier in gas trackers. Among this kind of devices, theGEM
chambers are widely used. The experimental signals acquired with the detector
mustobviously be reconstructed and analysed. In this contribution, a new
offline software to performreconstruction, alignment and analysis on the data
collected with APV-25 and TIGER ASICswill be presented. GRAAL (Gem
Reconstruction And Analysis Library) is able to measurethe performance of a
MPGD detector with a strip segmented anode (presently). The code isdivided in
three parts: reconstruction, where the hits are digitized and clusterized;
tracking,where a procedure fits the points from the tracking system and uses
that information to align thechamber with rotations and shifts; analysis, where
the performance is evaluated (e.g. efficiency,spatial resolution,etc.). The
user must set the geometry of the setup and then the programreturns
automatically the analysis results, taking care of different conditions of gas
mixture,electric field, magnetic field, geometries, strip orientation, dead
strip, misalignment and manyothers.
