{'fraction_non_alphanumeric': 0.027413587604290822, 'fraction_numerical': 0.05363528009535161, 'mean_word_length': 4.283018867924528, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Spectrophotometry of the continuum in the Crab Nebula

Detailed CCD photometry of the Crab Nebula has been made in four narrow wavelength bands centered on 9241, 6450, 5364 and 3808 A as well as through a filtertransmitting the [O III] line at 5007 A. Fluxes were measured on a 10″ × 10″ grid and the thermal continuum and line emission due to the filamentary shell was subtracted. Spectral indices (α) between 9241 and 5364 A were determined, typically with an accuracy of 0.02-0.03 and checked with the observations in the other wavelength bands. While there appears to be a general steepening of the synchrotron spectrum with distance to the pulsar, areas of rather flat spectrum are found at greater distances in the SE. The values of a range from just under 0.6 to over 1.0 for E B−V = 0 m 47, the colour excess adopted for this paper