prsm_data =
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        "e_value": "7.42e-09",
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                        "matched_peaks": {
                            "matched_peak": {
                                "ion_type": "Y",
                                "ion_position": "81",
                                "ion_display_position": "8",
                                "spec_id": "312",
                                "peak_id": "30",
                                "peak_charge": "1"
                            }
                        }
                    },
                    {
                        "position": "103",
                        "exist_n_ion": "0",
                        "exist_c_ion": "0",
                        "matched_peaks": null
                    },
                    {
                        "position": "104",
                        "exist_n_ion": "0",
                        "exist_c_ion": "0",
                        "matched_peaks": null
                    },
                    {
                        "position": "105",
                        "exist_n_ion": "0",
                        "exist_c_ion": "0",
                        "matched_peaks": null
                    },
                    {
                        "position": "106",
                        "exist_n_ion": "0",
                        "exist_c_ion": "1",
                        "matched_peaks": {
                            "matched_peak": {
                                "ion_type": "Y",
                                "ion_position": "85",
                                "ion_display_position": "4",
                                "spec_id": "312",
                                "peak_id": "20",
                                "peak_charge": "1"
                            }
                        }
                    },
                    {
                        "position": "107",
                        "exist_n_ion": "0",
                        "exist_c_ion": "0",
                        "matched_peaks": null
                    },
                    {
                        "position": "108",
                        "exist_n_ion": "0",
                        "exist_c_ion": "0",
                        "matched_peaks": null
                    },
                    {
                        "position": "109",
                        "exist_n_ion": "0",
                        "exist_c_ion": "0",
                        "matched_peaks": null
                    },
                    {
                        "position": "110",
                        "exist_n_ion": "0",
                        "exist_c_ion": "0",
                        "matched_peaks": null
                    }
                ],
                "ptm": {
                    "ptm_type": "Fixed",
                    "ptm": {
                        "abbreviation": "Carbamidomethylation",
                        "unimod": "-1",
                        "mono_mass": "57.0214640000"
                    },
                    "occurence": [
                        {
                            "left_pos": "38",
                            "right_pos": "39",
                            "anno": "C"
                        },
                        {
                            "left_pos": "86",
                            "right_pos": "87",
                            "anno": "C"
                        }
                    ]
                },
                "mass_shift": {
                    "id": "0",
                    "left_position": "32",
                    "right_position": "90",
                    "shift": "324.2584935793",
                    "anno": "+324.2585",
                    "shift_type": "unexpected"
                }
            }
        }
    }
}
