Added Falcon4 MTF files provided by Gijs.

data/mtf_falcon4EC_200kV.star

@@ -0,0 +1,68 @@
+data_
+loop_
+_rlnResolutionInversePixel
+_rlnMtfValue
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+0.46875	0.082460402
+0.4765625	0.083598335
+0.484375	0.08129187
+0.4921875	0.071874225

data/mtf_falcon4EC_300kV.star

@@ -0,0 +1,68 @@
+data_
+loop_
+_rlnResolutionInversePixel
+_rlnMtfValue
+0	0.999517475
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