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tokens: The authors are grateful to Amanda Heiderman and Neal Evans for their useful collaboration and discussion on embedded protostellar environments, and to Mike Dunham for his comments on the paper. Many thanks to the referee, Charles Lada, for his very useful comments and suggestions. Astrochemistry in Leiden is supported by the Netherlands Research School for Astronomy (NOVA), by a Royal Netherlands Academy of Arts and Sciences (KNAW) professor prize, by a Spinoza grant and grant 614.001.008 from the Netherlands Organisation for Scientific Research (NWO). The authors are indebted to the various observers who have collected data for their papers and kindly provided them to be included in the LOMASS database, as well as staff at the JAC. Acknowledgment is given to the following programs and languages for building this database: gildas-class and python for data reduction and format manipulation; python-matplotlib for plotting; MySQL for construction of the database; php and html for the web interface.