{'fraction_non_alphanumeric': 0.021447721179624665, 'fraction_numerical': 0.0, 'mean_word_length': 4.659090909090909, '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}}
The distribution and composition of intergalactic clouds at large red-shifts

Most of the sharp absorption lines in the spectra of quasars of high red-shift are single Lyman-α lines. The stronger ones have associated Lyman-β or Lyman-γ lines but not lines of heavy elements. Recent statistical studies have shown that the density of Lyman-α absorption lines is statistically the same in all quasars and that the lines are randomly distributed, with no tendency to cluster. It is now thought that the single Lyman-α absorption lines are produced by primordial, intergalactic clouds. Studies now in progress are aimed at giving limits on the heavy-element composition of the clouds, as well as a value for the deuterium abundance of primordial gas.