HI results of the FAST GPPS survey (IMAGE) Science China Press Caption The HI column density map integrated over the velocity range of -150 km/s to +150 km/s. Credit ©Science China Press Usage Restrictions Use with credit. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.