compute_velocity_ek     Compute velocity via Engbert & Kliegl (2003)
                        algorithm.
diff_ek                 Differentiate x and y and compute change
                        amplitude via an algorithm proposed by Engbert
                        & Kliegl (2003)
diff_nh                 Differentiate x and y and compute change
                        amplitude via an algorithm proposed by Nyström
                        and Holmqvist (2010) doi:10.3758/BRM.42.1.188
                        <https://doi.org/10.3758/BRM.42.1.188>
extract_saccades        Extract saccades from samples using votes from
                        selected methods.
method_ek               Extract saccades using an algorithm proposed by
                        Engbert and Kliegl (2003)
                        doi:10.1016/S0042-6989(03)00084-1
                        <https://doi.org/10.1016/S0042-6989%2803%2900084-1>
method_nh               Extract saccades using an algorithm proposed by
                        Nyström and Holmqvist (2010)
                        doi:10.3758/BRM.42.1.188
                        <https://doi.org/10.3758/BRM.42.1.188>.
method_om               Extract saccades using an algorithm proposed by
                        Otero-Millan et al. (2014) doi:10.1167/14.2.18
                        <https://doi.org/10.1167/14.2.18>
monocular_ten_trials    A monocular multi-trial recording
option_or_default       Extract value for a named list or use default
                        if key is missing
sd_via_median_estimator
                        Compute standard deviation via median
                        estimator.
single_trial            A single trial monocular samples recorded at
                        500 Hz.
single_trial_binocular
                        A single trial binocular recording.
