hi, helpful folks I am once again very confused, and would appreciate any help. I am still trying to make a plot which contains frb's created from datafiles at different time steps. This is what I have that I think should work, and doesn't: from yt.mods import * %matplotlib inline import matplotlib.pyplot as plt import matplotlib.colorbar as cb from matplotlib.colors import LogNorm import numpy as np ts = TimeSeriesData.from_filenames("Strat_Box_hdf5_plt_cnt_01*") print len(ts) #just checking num = len(ts) for index, val in enumerate(ts): print "%s = %s" % (index, val) #again, just checking that this does what I think orient = 'vertical' fig, axes, colorbars = get_multi_plot( num, 1, colorbar=orient, bw = 6) plots = [] for i, fn in enumerate(ts): pf = load(fn) # load data sl = pf.h.slice(0, pf.domain_center[0],fields=["Density","Temperature"] ) frb = sl.to_frb( (1.0, 'kpc'), (4096,1024),height=(4.0, 'kpc')) dens_axes = [axes[0][i]] for ax in dens_axes: ax.xaxis.set_visible(False) ax.yaxis.set_visible(False) plots = [dens_axes[0].imshow(frb["Density"], origin='lower', norm=LogNorm())] These are the errors that I get; TypeError Traceback (most recent call last)<ipython-input-6-cd09eb0aaf88> in <module>() 1 for i, fn in enumerate(ts):----> 2 pf = load(fn) # load data 3 sl = pf.h.slice(0, pf.domain_center[0],fields=["Density","Temperature"] ) 4 frb = sl.to_frb( (1.0, 'kpc'), (4096,1024),height=(4.0, 'kpc')) 5 dens_axes = [axes[0][i]] /Users/kde/yt-x86_64/src/yt-hg/yt/convenience.pyc in load(*args, **kwargs) 65 try: 66 from yt.data_objects.time_series import TimeSeriesData---> 67 ts = TimeSeriesData.from_filenames(*args, **kwargs) 68 return ts 69 except YTOutputNotIdentified: /Users/kde/yt-x86_64/src/yt-hg/yt/data_objects/time_series.pyc in from_filenames(cls, filenames, parallel, **kwargs) 263 filenames = glob.glob(filenames) 264 filenames.sort()--> 265 obj = cls(filenames[:], parallel = parallel, **kwargs) 266 return obj 267 /Users/kde/yt-x86_64/src/yt-hg/yt/data_objects/static_output.pyc in __getitem__(self, key) 146 for d in [self.units, self.time_units, self.parameters, \ 147 self.conversion_factors]:--> 148 if key in d: return d[key] 149 raise KeyError(key) 150 TypeError: unhashable type thanks kathy -- Kathy DeGioia Eastwood, Ph.D. Professor of Physics and Astronomy Northern Arizona University Flagstaff, AZ 86011-6010 Ph: 928-523-7159 FX: 928-523-1371 Kathy.Eastwood@nau.edu deliveries: 602 S. Humphreys St., Bldg 19 Rm 209