Abstract
Measurements of the angle of muons to the shower-core direction and the spread in angle of muons in extensive cosmic-ray showers of energy greater than 1017 eV are reported. These measurements, along with measurements of the lateral structure function of deep-water detectors and muon density detectors, are compared with rigorous computer simulations. The data are used to derive the average depth of electron cascade maximum as a function of primary particle energy.

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