CENTRAL 50 PERCENT OF DATA 

 ICHANGEI LESS THAN 2.19 FEET 

 ISLOPEI LESS THAN 0°25' 



CENTRAL 70 PERCENT OF DATA 

 ICHANGEI LESS THAN 4.54 FEET 

 ISLOPEI LESS THAN 0°51 ' 



-10 1( 



DEPTH CHANGE (FEET) 



Figure 78. Frequency distribution of all slopes in foot drop per 304-foot travel for both 

 shallow and deep isotherms separately, and cumulative percentage distribution of both 

 shallow and deep isotherms together (65,132 data points). 



the isotherm waves are nearly symmetrical, with the absolute- 

 value 50th percentile being the average of absolute values down 

 slope, 2. 17 feet, and up slope, 2. 22 feet per 304 feet of travel. 

 This corresponds to an absolute -value average median slope of 

 0°25'. The absolute -value 70th percentile comes from a 4.52-foot 

 down-slope and a 4. 57-foot up-slope change over the same dis- 

 tance, and corresponds to an average absolute-value median slope 

 of 0°51'. The Baja California waters thus contain much steeper 

 isotherms than does the open Pacific, where the 50th percentile of 

 absolute values of slope was 0°16' and the 70th absolute -value per- 

 centile, where the value is 0°30'. 3 



Some difference exists in the frequency distribution curves 

 of depth changes for the shallower and deeper isotherms. The 

 deeper isotherms show a flatter curve with fewer zero values and 

 more high slope values than do the shallow ones, which means 



40 



