def find_indices(header):
    """Return the positions of relevant fields in our rows."""
    return {
        'subject': header.index("Course Subject Short Nm"),
        'course_num': header.index("Course Number"),
        'section_num': header.index("Section Nbr"),
        'title': header.index("Course Title Nm"),
        'instructor': header.index("Instructor Name"),
        'ccn': header.index("Course Control Nbr"),
        'grade_name': header.index("Grade Nm"),
        'count': header.index("Enrollment Cnt"),
        'letter': header.index("Grade Type Desc"),
        'points': header.index("Average Grade"),
    }