Hi, http://yt-project.org/doc/cookbook/complex_plots.html#thin-slice-projections Is it possible to create a thin slice projection of particles (instead of density)? I tried the following three methods but get errors: 1. p = yt.ParticlePlot(ds, 2, ['particle_mass'], data_source=region) TypeError: __init__() got multiple values for keyword argument 'data_source' 2. p = yt.ParticleProjectionPlot(ds, 2, ['particle_mass'], data_source=region) finfo = self.ds._get_field_info("unknown", fname) 3. p = yt.ProjectionPlot(ds, 2, ['particle_mass'], data_source=region) File "/home/sagarwal/codes/yt/yt-x86_64/src/yt-hg/yt/visualization/plot_window.py", line 1429, in __init__ field_parameters = field_parameters, method = method) File "/home/sagarwal/codes/yt/yt-x86_64/src/yt-hg/yt/data_objects/construction_data_containers.py", line 253, in __init__ field = self._determine_fields(ensure_list(field)) File "/home/sagarwal/codes/yt/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.py", line 518, in _determine_fields finfo = self.ds._get_field_info("unknown", fname) Shankar