angle of refraction 2theta of 8 4 u00b0 and 8 6 u00b0 fig1 shows the x ray diffraction diagram of the f crystal form of the methanesulfonic acid addition salt of a compound of formula i in the x ray diagram the angle of refraction 2theta is plotted on the horizontal axis u03b1 axis and the relative line intensity background corrected peak intensity on the vertical y axis x ray powder diffraction patterns are measured on a bruker d8 gadds discover diffractometer with cu k u03b1 radiation source k u03b11 radiation wavelength u03bb 1 54060 angstr u00f6m the optical density of the lines on the film is proportional to the light intensity the film is scanned in using a line scanner the strongest line in the x ray diffraction diagram is observed at an angle of refraction 2theta of 20 9 u00b0 more broadly the f crystal form is characterized by refractions at angles of refraction 2theta of 8 4 u00b0 8 6 u00b0 13 3 u00b0 16 2 u00b0 16 8 u00b0 17 1 u00b0 19 5 u00b0 20 9 u00b0 23 6 u00b0 and 24 5 u00b0 in essentially pure material of the f crystal form of the methanesulfonic acid addition salt of a compound of formula i lines can be observed at angles of refraction 2theta 8 4 u00b0 8 6 u00b0 10 4 u00b0 13 3 u00b0 14 7 u00b0 16 2 u00b0 16 8 u00b0 17 1 u00b0 19 5 u00b0 20 9 u00b0 22 2 u00b0 23 1 u00b0 23 6 u00b0 24 5 u00b0 25 1 u00b0 26 0 u00b0 26 9 u00b0 28 5 u00b0 29 1 u00b0 and 30.