BTreeMap: 1.2234s
    phi0_integrand: 
        omnes: 29.30%
            get: 22.87%
            integrate_complex: 5.01%
                        delta_with_lut 
                            get: 2.50%
    omnes_integrand: 37.98%
        delta_with_lut -> get: 22.20%

HashMap: 1.0767s
    phi0_integrand: 
        omnes: 35.22%
            get: 30.40%
            integrate_complex: 3.95%
                        delta_with_lut 
                            get: 1.88%
    omnes_integrand: 27.21%
        delta_with_lut -> get: 14.03%
