I just noticed an issue that arises when loading an ART simulation when using the yt.load() command. When I use the command ds = yt.load("VELA07/10MpcBox_csf512_a0.020.d"), I get this response yt : [INFO ] 2018-07-25 15:59:41,434 Using root level of 14 yt : [INFO ] 2018-07-25 15:59:41,460 Discovered 7 species of particles yt : [INFO ] 2018-07-25 15:59:41,461 Particle populations: 34930688 4943872 855040 139392 21776 2088309 0 yt : [INFO ] 2018-07-25 15:59:42,098 Max level is 06 yt : [INFO ] 2018-07-25 15:59:42,167 Parameters: current_time = 0.051136094792605884 Gyr yt : [INFO ] 2018-07-25 15:59:42,168 Parameters: domain_dimensions = [128 128 128] yt : [INFO ] 2018-07-25 15:59:42,168 Parameters: domain_left_edge = [0. 0. 0.] yt : [INFO ] 2018-07-25 15:59:42,169 Parameters: domain_right_edge = [1. 1. 1.] yt : [INFO ] 2018-07-25 15:59:42,170 Parameters: cosmological_simulation = True yt : [INFO ] 2018-07-25 15:59:42,170 Parameters: current_redshift = 48.70056421389564 yt : [INFO ] 2018-07-25 15:59:42,170 Parameters: omega_lambda = 0.7300000190734863 yt : [INFO ] 2018-07-25 15:59:42,170 Parameters: omega_matter = 0.27000001072883606 yt : [INFO ] 2018-07-25 15:59:42,171 Parameters: hubble_constant = 0.699999988079071 yt : [INFO ] 2018-07-25 15:59:42,350 discovered particle_header:/nobackupp2/sflarkin/VELA07/PMcrda0.410.DAT yt : [INFO ] 2018-07-25 15:59:42,351 discovered particle_data:/nobackupp2/sflarkin/VELA07/PMcrs0a0.320.DAT yt : [INFO ] 2018-07-25 15:59:42,352 discovered particle_stars:/nobackupp2/sflarkin/VELA07/stars_a0.390.dat The bottom three lines show that when I am loading the .020 snapshot, I am getting particle headers and data from entirely different snapshots. To address this, i used the file_particle_header specification, as listed her on the Loading Data page. http://yt-project.org/doc/examining/loading_data.html However, it appears that these commands do not support wildcards like * for reading multiple files, as when I changed my code to support this, I got this error. P002 yt : [ERROR ] 2018-07-25 15:43:39,114 FileNotFoundError: [Errno 2] No such file or directory: '/nobackupp2/sflarkin/VELA07test/PMcrda0*' Is there a way to specify the correct files that uses wildcards to load the proper data?