Hi all, I'm trying to make projections for uniform grid FLASH4 data with the most updated YT, but there're errors when adding projections: yt : [WARNING ] 2012-08-07 23:13:56,239 integer runtime parameter checkpointfilenumber overwrites a simulation scalar of the same name yt : [INFO ] 2012-08-07 23:13:56,244 Parameters: current_time = 0.0 yt : [INFO ] 2012-08-07 23:13:56,245 Parameters: domain_dimensions = [512 256 1] yt : [INFO ] 2012-08-07 23:13:56,245 Parameters: domain_left_edge = [ 1.50000000e+07 -6.55360000e+09 0.00000000e+00] yt : [INFO ] 2012-08-07 23:13:56,245 Parameters: domain_right_edge = [ 2.62144000e+10 6.55360000e+09 1.74532925e-02] yt : [INFO ] 2012-08-07 23:13:56,245 Parameters: cosmological_simulation = 0.0 yt : [INFO ] 2012-08-07 23:13:56,587 Max Value is 2.46340e+06 at 38378027.3437500000000000 6400000.0000000000000000 0.5000000000000000 in grid FLASHGrid_0033 ([128 128 1]) at level 0 (1, 0, 0) yt : [INFO ] 2012-08-07 23:13:56,587 Created plot collection with default plot-center = [13114700000.0, 0.0, 0.0087266462599716477] Traceback (most recent call last): File "proj.py", line 18, in <module> p1 = pc.add_projection(my_var, 2) File "/aphelion/jisuoqing/yt-x86_64/src/yt-hg/yt/visualization/plot_collection.py", line 784, in add_projection **field_parameters) File "/aphelion/jisuoqing/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.py", line 1697, in __init__ self._initialize_source(source) File "/aphelion/jisuoqing/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.py", line 1724, in _initialize_source source = self.pf.h.all_data() File "/aphelion/jisuoqing/yt-x86_64/src/yt-hg/yt/data_objects/hierarchy.py", line 188, in all_data pf.domain_left_edge, pf.domain_right_edge) File "/aphelion/jisuoqing/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.py", line 3221, in __init__ self._refresh_data() File "/aphelion/jisuoqing/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.py", line 315, in _refresh_data self.get_data() File "/aphelion/jisuoqing/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.py", line 2508, in get_data raise YTNoDataInObjectError(self) yt.utilities.exceptions.YTNoDataInObjectError: The object requested has no data included in it. And another separated question: how can I add axis ticks onto projection or slice plot to show the spacial scale? I suspect there should exist some easy way, but I failed to find it. Thanks for your care! All best, Suoqing