diff -r 26ba013a14a7 -r aaeb64dc946b docs/faq/faq.rst
--- a/docs/faq/faq.rst	Thu Nov 03 13:13:01 2016 +0200
+++ b/docs/faq/faq.rst	Thu Nov 03 13:13:20 2016 +0200
@@ -5,7 +5,7 @@
 Using an ancillary file
 ~~~~~~~~~~~~~~~~~~~~~~~
 
-Q: I use the “Quick upload” to submit a measurement file together with an ancillary 
+Q: I use the �Quick upload� to submit a measurement file together with an ancillary 
 file. Will this ancillary file be used in the processing of my measurement. 
 
 A: No. Which ancillary file is used when processing a measurement is defined in the 
@@ -47,6 +47,23 @@
 module will be implemented at the end of ACTRIS project. 
 
 
+Minimum number of analog files to submit
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Q: Is it possible to submit a single analog profile for processing?
+
+
+A: It depepends on the type of product you ar trying to calculate.
+
+* If the product is a linear polarization calibration,  it is possible to submit a timeseries containing 
+  one single analog profile. This is allowed because some stations are performing depolarization calibration measurements using 
+  single profiles. If the errors are present they will be taken into account for the calculation of the error on calibration constant. 
+  If they are not the error on calibration constant is calculate as the standard deviation withing the calibration range.
+
+* If the product to calculate is NOT a linear polarization calibration, if the raw analog error have not been provided we need at
+  least 3 raw profile in order to compute the statistical error
+
+
 High/low range channels
 ~~~~~~~~~~~~~~~~~~~~~~~
 Q: What is the definition of low range, ultra near range and high range channels?