Index: options.reference/SPECIES/SPECIES.README
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--- options.reference/SPECIES/SPECIES.README	(revision 0ff3b23623caf1ecddf7244a216951d6e1396147)
+++ options.reference/SPECIES/SPECIES.README	(revision 0ff3b23623caf1ecddf7244a216951d6e1396147)
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+Specifies all physico-chemical properties for the species. 
+
+To generate an overview table compile the specoverview.f90 program
+
+gfortran specoverview.f90 -o specoverview
+./specoverview
+
+UPDATE FOR FLEXPART VERSION 10.3:
+---------------------------------------------------------------------------------------------------------------------------
+Please note that the format of the SPECIES files has changed from the previous version (9.2) of FLEXPART and it is important
+to update all SPECIES files accordingly. The use of SPECIES files from older FLEXPART versions may lead to run-time
+errors or erroneous results.
+---------------------------------------------------------------------------------------------------------------------------
+Half life due to radioactive or chemical decay and can be switched off by specifying a negative value.
+Molecular weight (molweight of the species, needed for mixing ratio output)
+---------------------------------------------------------------------------------------------------------------------------
+WET DEPOSITION
+
+Below-cloud scavenging
+- Gases:
+	A and B are the parameters for below-cloud scavenging defined by Eq. scavenging coefficient = A x precipitation-rate^B
+        If you migrate from FLEXPART version 9.2 and below this is equal to A and B as it was.
+- Particles: 
+	A "rain collection efficiency"  
+	B "snow collection efficiency" are both defined by Equations 46-47.
+	Suggested values for particle scavenging are A=1.0,B=1.0.
+	Using values A=0.2 and B=0.2 will give results close to the old scavenging scheme of FLEXPART version 9.2 and below.
+
+In-cloud scavenging
+- Gases:
+    Is switched on if Ai or Bi are given greater than 0
+    If you migrate from FLEXPART version 9.2 and below this is equal to Ai and Bi should be set to 1
+- Particles:
+	Ai ("Cloud Condensation Nuclei (CCN) efficiency") 
+	Bi ("Ice Nuclei (IN) efficiency")                  are both from Eq. 51. 	
+	Suggested values for particle scavenging are  Ai=0.9 and Bi=0.1.
+	Using values Ai=0.9 and Bi=0.9 should give results cto the old scavenging scheme of FLEXPART version 9.2 and below.
+---------------------------------------------------------------------------------------------------------------------------
+DRY DEPOSITION
+- Gases: 
+	D is the diffusivity of water vapor and 
+	D_i is the diffusivity of the species, 
+	H is the effective Henry's constant, 
+	f0 varies between 0 and 1 and gives the reactivity of a species relative to that of ozone. For non-reactive species f0 is 0, for slightly reactive it is 0.1 and for highly reactive it is 1. 
+	Dry deposition of gases is switched off by negative D. 
+- Particles:
+	rho specifies the density of the substance, 
+	dquer its mean diameter 
+	dsig the measure of variation.
+	If no detailed information for deposition velocity calculation is available, a constant deposition velocity vd [cm s-1] can be used. 
+	Dry deposition of particles is switched off by negative rho.
+---------------------------------------------------------------------------------------------------------------------------
+OH REACTION:
+	can be turned on by giving parameter C [cm^3/molecule/sec]], D [K] and N [no unit] positive values, defined by Eq. 39.
+	OH reaction is switched off by negative C.
+---------------------------------------------------------------------------------------------------------------------------
+Optionally  emission variation information 
+	can be added at the end of the file, defined as following: Since FLEXPART version 6.0, emission factors can be defined that change the temporal variation of particle releases. This is useful, for instance,
+to simulate the typical daily and weekly cycle of anthropogenic emissions. The emission factors are given in the file of the
+corresponding species SPECIES_nnn, where nnn is the species number defined in file RELEASES. If no emission variation
+information is given, emission rates for species nnn are taken as constant. Release rates can vary with the hour of the day
+and with the day of the week, according to the local time at the release location. Emission factors must be 1 on average. 24
+hourly as well as 7 daily values must be specified. Furthermore, different disaggregation factors must be given for area sources
+and for point sources. FLEXPART distinguishes between the two using the lower altitude of the release box: area sources are
+assumed to start below 0.5 m above the ground, whereas point sources are assumed to be higher. Please note that when this
+option is used, it is not so easy to determine the maximum number of particles present at a particular time of the model run. It
+might then be necessary to increase the parameter maxpart to a higher value than what would otherwise be needed.
