from typing import List
import re


def get_2dnmr_indices(headers: List[str]) -> List[int]:
    """Examine headers for 2D NMR signatures and return column indices"""
    nmr2d_col_index = [
        idx
        for idx, i in enumerate(headers)
        if re.search(r"(HMBC)|(HSQC)|(([E]?CO|TOC|NOE|ROE)SY)", headers[idx])
    ]
    return nmr2d_col_index