def set_flow_cb(self, cb):
        self._flow_control_cb = cb
approximate pointwise confidence interval for kernel density
dataset/ETHPy150Open agoragames/haigha/haigha/classes/channel_class.py/ChannelClass.set_flow_cb--crossover with--dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/sandbox/nonparametric/kernels.py/CustomKernel.density_confint