if(height > 2000 and code.find("TRACE") < 0 and
           code.find("ALLOWTRACE") < 0 and code.find("BADIDEA") < 0):
            estr = 'coefficients are not valid for altitudes above 2000 km. You'
            estr += ' must either use field-line tracing (trace=True '
            estr += 'or allowtrace=True) or indicate you know this '