Styling Points and having a fixed x-axis labels

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Using the Flot - Point graphs , for example, having the code

$(function() {

var d3 = [[0, 0],[0.5, 0.5], [1, 1], [1.5, 1.5],[2, 2], [2.5, 2.5],[3, 3]];

var plot = $.plot(placeholderHydro, [d1, d2, d3]);

$.plot("#placeholderHydro", [{

data: d3,

points: { show: true }

}]);

});

How do I style the points? it is currently showing up as yellow, enlarged dots but what if I want a simple, small red dots?

Also, for the x-axis, how do I have a fixed-interval of 0 - 24 hours, incrementing by 1 hour so that it is 0, 1, 2, 3, 4, 5, 6 ...... 24