Diogo, Francisco2019-02-042019-02-042015-07-12http://dx.doi.org/10.22323/1.236.0413http://hdl.handle.net/10400.26/27168In addition to the standard X$_{max}$ and energy, the longitudinal profiles of extensive air showers contain some more interesting information. For energies above 10$^{17:8}$ eV, we present the average profiles as a function of atmospheric depth measured for the first time at the Pierre Auger Observatory. The profile shapes for different energy ranges are all well reproduced by a Gaisser- Hillas function within the range studied. A detailed analysis of the systematic uncertainties is performed using data and a full detector simulation, and the results are compared with predictions of hadronic interaction models for different primaries.engjournal article2019-02-04