Hello everyone, I am working with cosmological simulations and I am trying to make use of the ability to save spatial plots as datasets. I am running into an issue after reloading the data when I try to center the plot on a specific halo. When I specify the center in the yt.ProjectionPlot function after reading in the .h5 file, if I print the center of the projection it returns "[0.5,0.5]", which is the center of the simulation not the center I specified. I am confused why this doesn't work because creating the same plot without saving and reloading data results in a projection with the correct center. The script I am using is below: import yt import numpy as np #load in the simulation ds = yt.load('/mnt/research/galaxies-REU/sims/cosmological/set1_LR/halo_008508/RD0032/RD0032') center = [0.4915,0.478,0.5066] # Creating the projection from the dataset proj = ds.proj('density','x',weight_field=None) #Saving projection as a dataset fn = proj.save_as_dataset() # Making a regular projection plot to compare to plot = yt.ProjectionPlot(ds,'x','density',center=center,width=(2,'Mpc'),weight_field='density') plot.save('projection_from_ProjectionPlot.png') # Print the center for the Projection Plot print('\n\n',plot.center,'\n\n') # Load in the saved object from before new_plot = yt.load(fn) #Make a new projection plot from the loaded in saved dataset new_proj = yt.ProjectionPlot(new_plot,'x','density',center=center,width=(2,'Mpc'),weight_field='density') new_proj.save('projection_from_ds_proj.png') #Print the center of the new projection plot print('\n\n',new_proj.center,'\n\n') This script will save two plots, one will be made from the saved and reloaded data and the other will be just from yt.ProjectionPlot. It will also print the center for the projection after saving and loading the data (which seems to always be [0.5,0.5]) and the center for the normal projection (which will always be [0.478,0.5066]). By comparing the two plots that it saves, the "projection_from_ProjectionPlot.png" image is centered on the correct halo, while the "projection_from_ds_proj.png" is centered on the center of the simulation and not the correct halo. I have tried specifying the center in the "ds.proj" arguments to no avail, and I have tried specifying the center in "ds.proj" and not setting it in yt.ProjectionPlot for the saved data and this did not work either. Any help would be much appreciated! Thank you, Trevor Fush