# {'TIME': [data], 'CH1': [data], 'CH2': [data]}
def cut_time(data : dict, start : float, end : float) -> dict:
    idx_start = 0
    idx_end = 0

    for idx, t in enumerate(data['TIME']):
        if t > start and idx_start == 0:
            idx_start = idx
        if t > end and idx_end == 0:
            idx_end = idx
        if idx_end != 0 and idx_start != 0:
            break
    
    if idx_end != 0 and idx_start != 0: 
        return {key: value[idx_start:idx_end] for key, value in data.items()}
    else:
        return None