Figure 6.46 shows isobars of sea-level pressure from an early jamuary day in 2009. five points are marked with the letters a to e. 988 992 028 012 1020 24 1016 e a figuee 6.46 laboratory exarciso 9 isobars of sea-level pressure from an earty january day in 2009. a. mark all centers of high and low sea-level pressure with an "h" or"l' (by center, we mean at least one closed isobar). indicate two locations where there is likely a center of high or low pressure just off the map. b. locate two troughs and two ridges, and mark their axes with the appropriate symbols (dashed line for trough axis, serrated line for ridge axis). c. at each lettered location, use the isobars to estimate the wind direction. to represent the wind, draw a wind barb using the convention for station models you learned in chapter 1 (treat the dots as cloud circles). d. based solely on the spacing of the isobars, arrange the points in order of increasing wind speed. explairn your reasoning.