You could use a map to associate each letter with an array of numbers, as demonstrated below. This way there is no need to use if statements to extract values. You might also consider reading the values from a file rather than hard-coding them to make the program more flexible.
HashMap<Character, double[]> map = new HashMap<Character, double[]>();
map.put('A', new double[] { 142,83,66,0.06,0.076,0.035,0.058 });
map.put('R', new double[] { 98,93,95,0.07,0.106,0.099,0.085 });
double x = map.get('A')[0]; // Sets x to the first value in A (142)
double y = map.get('R')[2]; // Sets y to the third value in R (95)