Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_203_279 ( id number, "interferometer and observing mode" text, "waveband" text, "limiting magnitude" number, "minimum baseline (m)\n(un-projected)" number, "maximum baseline (m)" number, "approx. no. visibility measurements per year\n(measurements per night x nights used per year)" number, "max ratio of no. phase / no. amplitude measurements\n(measure of imaging performance, 0 = none)" number, "accuracy of amplitude2 measurements" text, "accuracy of phase measurements\n(milli-radians)" number, "number of spectral channels\n(max in use simultaneously)" text, "comments" text )

### Question ###
what 's the total limiting matitude of coast visible and coast infrared ?

### Accurate SQL ###

SELECT SUM("limiting magnitude") FROM table_203_279 WHERE "interferometer and observing mode" IN ('coast visible', 'coast infrared')